diff --git a/engine/enginerpc/engine.proto b/engine/enginerpc/engine.proto
index f11b867dda0..2280e53f9d1 100644
--- a/engine/enginerpc/engine.proto
+++ b/engine/enginerpc/engine.proto
@@ -356,6 +356,9 @@ message EngineHost {
     UNREACHABLE = 2;
   }
   State current_state = 6;
+  string display_name = 7;
+  repeated string parent_hosts = 8;
+  repeated string child_hosts = 9;
 }
 
 message ContactIdentifier {
diff --git a/engine/enginerpc/engine_impl.cc b/engine/enginerpc/engine_impl.cc
index 0476f9dc9d0..f32a0aefc5e 100644
--- a/engine/enginerpc/engine_impl.cc
+++ b/engine/enginerpc/engine_impl.cc
@@ -245,9 +245,19 @@ grpc::Status engine_impl::GetHost(grpc::ServerContext* context [[maybe_unused]],
         host->set_alias(selectedhost->get_alias());
         host->set_address(selectedhost->get_address());
         host->set_check_period(selectedhost->check_period());
+        host->set_id(selectedhost->host_id());
         host->set_current_state(
             static_cast<EngineHost::State>(selectedhost->get_current_state()));
-        host->set_id(selectedhost->host_id());
+        host->set_display_name(selectedhost->get_display_name());
+
+        if (!selectedhost->parent_hosts.empty())
+          for (const auto& [key, _] : selectedhost->parent_hosts)
+            host->add_parent_hosts(key);
+
+        if (!selectedhost->child_hosts.empty())
+          for (const auto& [key, _] : selectedhost->child_hosts)
+            host->add_child_hosts(key);
+
         return 0;
       });
 
diff --git a/tests/broker-engine/parent_child_relation.robot b/tests/broker-engine/parent_child_relation.robot
new file mode 100644
index 00000000000..2a123df2f5e
--- /dev/null
+++ b/tests/broker-engine/parent_child_relation.robot
@@ -0,0 +1,262 @@
+*** Settings ***
+Documentation       Centreon Engine/Broker verify relation parent child host.
+
+Resource            ../resources/import.resource
+
+Suite Setup         Ctn Clean Before Suite
+Suite Teardown      Ctn Clean After Suite
+Test Setup          Ctn Stop Processes
+Test Teardown       Ctn Save Logs If Failed
+
+
+*** Test Cases ***
+
+EBPN0
+    [Documentation]    Verify if child is in queue when parent is down.
+    [Tags]    broker    engine    MON-151686
+    
+    Ctn Config Engine    ${1}    ${5}    ${1}
+    Ctn Config Broker    rrd
+    Ctn Config Broker    central
+    Ctn Config Broker    module
+    Ctn Config BBDO3    1
+
+    Ctn Broker Config Log    rrd    rrd    trace
+    Ctn Broker Config Log    central    sql    debug
+    Ctn Broker Config Log    rrd    core    error
+    Ctn Engine Config Set Value    0    log_level_checks    debug
+    Ctn Config Broker Sql Output    central    unified_sql    10
+    Ctn Broker Config Flush Log    central    0
+    Ctn Broker Config Flush Log    rrd    0
+
+    Ctn Clear Retention
+    Ctn Clear Db    resources
+
+    # force the check result to 2
+    Ctn Config Host Command Status    ${0}    checkh1    2
+
+    # host_1 is parent of host_2
+    Ctn Add Parent To Host    0    host_2    host_1
+
+    ${start}    Get Current Date
+    Ctn Start Broker
+    Ctn Start Engine
+    Ctn Wait For Engine To Be Ready    ${start}    ${1}
+
+    # check if host_2 is child of host_1
+    Connect To Database    pymysql    ${DBName}    ${DBUser}    ${DBPass}    ${DBHost}    ${DBPort}
+
+    FOR    ${index}    IN RANGE    30
+        ${output}    Query
+        ...    SELECT child_id, parent_id FROM hosts_hosts_parents
+        Log To Console    ${output}
+        Sleep    1s
+        IF    "${output}" == "((2, 1),)"    BREAK
+    END
+    Should Be Equal As Strings    ${output}    ((2, 1),)    host parent not inserted
+    
+    # check if host_1 is pending
+    ${result}    Ctn Check Host Status    host_1    4    1    True
+    Should Be True    ${result}    host_1 should be pending
+
+    ${result}    Ctn Check Host Status    host_2    4    1    True
+    Should Be True    ${result}    host_2 should be pending
+
+    ${content}    Create List    INITIAL HOST STATE: host_1;
+    ${result}    Ctn Find In Log With Timeout    ${engineLog0}    ${start}    ${content}    60
+    Should Be True
+    ...    ${result}
+    ...    An Initial host state on host_1 should be raised before we can start our external commands.
+    
+    Ctn Process Host Check Result    host_1    0    host_1 UP
+
+    FOR    ${i}    IN RANGE    ${4}
+        Ctn Schedule Forced Host Check    host_1    ${VarRoot}/lib/centreon-engine/config0/rw/centengine.cmd
+        Sleep    1s
+    END
+
+    ${content}    Create List
+    ...    EXTERNAL COMMAND: SCHEDULE_FORCED_HOST_CHECK;host_1;
+    ...    HOST ALERT: host_1;DOWN;HARD;
+
+    ${result}    Ctn Find In Log With Timeout    ${engineLog0}    ${start}    ${content}    60
+    Should Be True    ${result}    Message about SCHEDULE HOST should be down in log.
+
+    ${result}    Ctn Check Host Status    host_1    1    1    True
+    Should Be True    ${result}    host_1 should be down/hard
+
+    ${content}    Create List
+     ...    Check of child host 'host_2' queued.
+    ${result}    Ctn Find In Log With Timeout    ${engineLog0}    ${start}    ${content}    60
+    Should Be True    ${result}    Check of child host 'host_2' should be queued.
+
+    Disconnect From Database
+    Ctn Stop Engine
+    Ctn Kindly Stop Broker
+
+EBPN1
+    [Documentation]    verify relation parent child when delete parent.
+    [Tags]    broker    engine    MON-151686
+    
+    Ctn Config Engine    ${1}    ${5}    ${1}
+    Ctn Config Broker    rrd
+    Ctn Config Broker    central
+    Ctn Config Broker    module
+    Ctn Config BBDO3    1
+
+    Ctn Broker Config Log    rrd    rrd    error
+    Ctn Broker Config Log    rrd    core    error
+    Ctn Broker Config Log    module0    core    error
+
+    Ctn Broker Config Log    central    sql    debug
+    Ctn Engine Config Set Value    0    log_level_checks    error
+    Ctn Config Broker Sql Output    central    unified_sql    10
+    Ctn Broker Config Flush Log    central    0
+    Ctn Broker Config Flush Log    rrd    0
+
+    Ctn Clear Retention
+    
+
+    # host_1 is parent of host_2
+    Ctn Add Parent To Host    0    host_2    host_1
+
+    ${start}    Get Current Date
+    Ctn Start Broker
+    Ctn Start Engine
+    Ctn Wait For Engine To Be Ready    ${start}    ${1}
+
+    ${output}    Ctn Get Host Info Grpc    ${2}
+    Log To Console    parents:${output}[parentHosts]
+    Should Contain    ${output}[parentHosts]    host_1    parentHosts
+
+    ${output}    Ctn Get Host Info Grpc    ${1}
+    Log To Console    childs:${output}[childHosts]
+    Should Contain    ${output}[childHosts]    host_2    childHosts
+
+    Connect To Database    pymysql    ${DBName}    ${DBUser}    ${DBPass}    ${DBHost}    ${DBPort}
+
+    FOR    ${index}    IN RANGE    30
+        ${output}    Query
+        ...    SELECT child_id, parent_id FROM hosts_hosts_parents
+        Log To Console    ${output}
+        Sleep    1s
+        IF    "${output}" == "((2, 1),)"    BREAK
+    END
+    Should Be Equal As Strings    ${output}    ((2, 1),)    the parent link not inserted
+    
+    Ctn Engine Config Del Block In Cfg    ${0}    host    host_1    hosts.cfg
+    Ctn Engine Config Del Block In Cfg    ${0}    service    host_1    services.cfg
+    Ctn Engine Config Delete Value In Hosts    ${0}    host_2    parents
+
+    ${start}    Get Current Date
+    Ctn Reload Engine
+    Ctn Wait For Engine To Be Ready    ${start}    ${1}
+    ${content}    Create List    Reload configuration finished
+    ${result}    Ctn Find In Log With Timeout
+    ...    ${ENGINE_LOG}/config0/centengine.log
+    ...    ${start}
+    ...    ${content}
+    ...    60
+    ...    verbose=False
+    Should Be True    ${result}    Engine is Not Ready after 60s!!
+
+
+    ${output}    Ctn Get Host Info Grpc    ${2}
+    Log To Console    parents:${output}[parentHosts]
+    Should Be Empty    ${output}[parentHosts]
+
+    FOR    ${index}    IN RANGE    30
+        ${output}    Query
+        ...    SELECT child_id, parent_id FROM hosts_hosts_parents
+        Log To Console    ${output}
+        Sleep    1s
+        IF    "${output}" == "()"    BREAK
+    END
+    Should Be Equal As Strings    ${output}    ()    the parent link should be deleted
+
+    Disconnect From Database
+    Ctn Stop Engine
+    Ctn Kindly Stop Broker
+
+EBPN2
+    [Documentation]    verify relation parent child when delete child.
+    [Tags]    broker    engine    MON-151686
+    
+    Ctn Config Engine    ${1}    ${5}    ${1}
+    Ctn Config Broker    rrd
+    Ctn Config Broker    central
+    Ctn Config Broker    module
+    Ctn Config BBDO3    1
+
+    Ctn Broker Config Log    rrd    rrd    error
+    Ctn Broker Config Log    rrd    core    error
+    Ctn Broker Config Log    module0    core    error
+
+    Ctn Broker Config Log    central    sql    debug
+    Ctn Engine Config Set Value    0    log_level_checks    error
+    Ctn Config Broker Sql Output    central    unified_sql    10
+    Ctn Broker Config Flush Log    central    0
+    Ctn Broker Config Flush Log    rrd    0
+
+    Ctn Clear Retention
+
+    # host_1 is parent of host_2
+    Ctn Add Parent To Host    0    host_2    host_1
+
+    ${start}    Get Current Date
+
+    Ctn Start Broker
+    Ctn Start Engine
+    Ctn Wait For Engine To Be Ready    ${start}    ${1}
+
+    ${output}    Ctn Get Host Info Grpc    ${2}
+    Log To Console    parents:${output}[parentHosts]
+    Should Contain    ${output}[parentHosts]    host_1    parentHosts
+
+    ${output}    Ctn Get Host Info Grpc    ${1}
+    Log To Console    childs:${output}[childHosts]
+    Should Contain    ${output}[childHosts]    host_2    childHosts
+
+    Connect To Database    pymysql    ${DBName}    ${DBUser}    ${DBPass}    ${DBHost}    ${DBPort}
+
+    FOR    ${index}    IN RANGE    30
+        ${output}    Query
+        ...    SELECT child_id, parent_id FROM hosts_hosts_parents
+        Log To Console    ${output}
+        Sleep    1s
+        IF    "${output}" == "((2, 1),)"    BREAK
+    END
+    Should Be Equal As Strings    ${output}    ((2, 1),)    the parent link not inserted
+
+    Ctn Engine Config Del Block In Cfg    ${0}    host    host_2    hosts.cfg
+    Ctn Engine Config Del Block In Cfg    ${0}    service    host_2    services.cfg
+    Ctn Engine Config Delete Value In Hosts    ${0}    host_2    parents
+
+    ${start}    Get Current Date
+    Ctn Reload Engine
+    Ctn Wait For Engine To Be Ready    ${start}    ${1}
+    ${content}    Create List    Reload configuration finished
+    ${result}    Ctn Find In Log With Timeout
+    ...    ${ENGINE_LOG}/config0/centengine.log
+    ...    ${start}
+    ...    ${content}
+    ...    60
+    ...    verbose=False
+    Should Be True    ${result}    Engine is Not Ready after 60s!!
+
+    ${output}    Ctn Get Host Info Grpc    ${1}
+    Log To Console    childs:${output}[childHosts]
+    Should Be Empty    ${output}[childHosts]
+
+    FOR    ${index}    IN RANGE    30
+        ${output}    Query
+        ...    SELECT child_id, parent_id FROM hosts_hosts_parents
+        Log To Console    ${output}
+        Sleep    1s
+        IF    "${output}" == "()"    BREAK
+    END
+    Should Be Equal As Strings    ${output}    ()    the parent link should be deleted
+
+    Disconnect From Database
+    Ctn Stop Engine
+    Ctn Kindly Stop Broker
\ No newline at end of file
diff --git a/tests/resources/Engine.py b/tests/resources/Engine.py
index 3df8fddf7db..2def5e7ec3c 100755
--- a/tests/resources/Engine.py
+++ b/tests/resources/Engine.py
@@ -32,6 +32,7 @@
 from array import array
 from dateutil import parser
 import datetime
+from google.protobuf.json_format import MessageToDict
 from os import makedirs, chmod
 from os.path import exists, dirname
 from robot.api import logger
@@ -3648,3 +3649,102 @@ def ctn_send_otl_to_engine(port: int, resource_metrics: list):
             logger.console("gRPC server not ready")
 
 
+def ctn_engine_config_del_block_in_cfg(idx: int, type: str, key: str, file):
+    """
+    Delete a element in the file given for the Engine configuration idx.
+
+    Args:
+        idx (int): Index of the Engine configuration (from 0)
+        type (str): The type (host/service/...).
+        key (str): The parameter that will be deleted.
+        file (str): The file to delete the key from.
+    """
+    filename = f"{ETC_ROOT}/centreon-engine/config{idx}/{file}"
+    
+    with open(filename, "r") as f:
+        content = f.read()
+
+    if type == "host":
+        pattern = rf"define host \{{\s*host_name\s+{re.escape(key)}\b.*?\}}"
+    elif type == "service":
+        pattern = rf"define service \{{\s*host_name\s+{re.escape(key)}\b.*?\}}"
+
+    # Use re.sub to remove the matched block
+    new_content = re.sub(pattern, '', content, flags=re.DOTALL)
+    new_content = re.sub(r'\n\s*\n', '\n', new_content)
+
+    if content != new_content:
+        with open(filename, "w") as f:
+            f.write(new_content)
+    else:
+        logger.console(f'\n\033[91mFailed : Cannot delete the block  with the type : {type} and the key : {key} in {file}\033[0m')
+
+def ctn_get_host_info_grpc(id:int):
+    """
+    Retrieve host information via a gRPC call.
+
+    Args:
+        id: The identifier of the host to retrieve.
+
+    Returns:
+        A dictionary containing the host informations, if successfully retrieved.
+    """
+    if id is not None:
+        limit = time.time() + 30
+        while time.time() < limit:
+            time.sleep(1)
+            with grpc.insecure_channel("127.0.0.1:50001") as channel:
+                stub = engine_pb2_grpc.EngineStub(channel)
+                request = engine_pb2.HostIdentifier(id=id)
+                try:
+                    host = stub.GetHost(request)
+                    host_dict = MessageToDict(host, always_print_fields_with_no_presence=True)
+                    return host_dict
+                except Exception as e:
+                    logger.console(f"gRPC server not ready {e}")
+    return {}
+
+def ctn_engine_config_delete_value_in_hosts(idx: int, desc: str, key: str, file: str = 'hosts.cfg'):
+    """
+    Delete a parameter in the hosts.cfg for the Engine configuration idx.
+
+    Args:
+        idx (int): Index of the Engine configuration (from 0)
+        desc (str): host name of the host to modify.
+        key (str): the parameter that will be deleted.
+        file (str): The file to modify, default value 'hosts.cfg'
+    """
+
+
+    filename = f"{ETC_ROOT}/centreon-engine/config{idx}/{file}"
+    with open(filename, "r") as f:
+        lines = f.readlines()
+
+    r = re.compile(r"^\s*host_name\s+" + desc + "\s*$")
+    rbis = re.compile(r"^\s*name\s+" + desc + "\s*$")
+    found = False
+    for i in range(len(lines)):
+        if r.match(lines[i]):
+            print("here" + lines[i])
+            for j in range(i + 1, len(lines)):
+                if '}' in lines[j]:
+                    break
+                if key in lines[j]:
+                    del lines[j]
+                    found = True
+                    break
+            break
+
+    if not found:
+        for i in range(len(lines)):
+            if rbis.match(lines[i]):
+                for j in range(i + 1, len(lines)):
+                    if '}' in lines[j]:
+                        break
+                    if key in lines[j]:
+                        del lines[j]
+                        found = True
+                        break
+                break
+    with open(filename, "w") as f:
+        f.writelines(lines)
\ No newline at end of file