diff --git a/backend/infrahub/core/diff/query_parser.py b/backend/infrahub/core/diff/query_parser.py
index 9e375d5cf3..1a1c6577f9 100644
--- a/backend/infrahub/core/diff/query_parser.py
+++ b/backend/infrahub/core/diff/query_parser.py
@@ -275,7 +275,11 @@ class DiffRelationshipIntermediate:
     _single_relationship_list: list[DiffSingleRelationshipIntermediate] = field(default_factory=list)
 
     def add_path(self, database_path: DatabasePath) -> None:
-        if database_path.property_type == DatabaseEdgeType.IS_RELATED:
+        if database_path.property_type in [
+            DatabaseEdgeType.IS_RELATED,
+            DatabaseEdgeType.HAS_OWNER,
+            DatabaseEdgeType.HAS_SOURCE,
+        ]:
             value = database_path.peer_id
         else:
             value = database_path.property_value
@@ -553,7 +557,7 @@ def _remove_empty_base_diff_root(self) -> None:
             for relationship_diff in node_diff.relationships_by_name.values():
                 for diff_relationship_property_list in relationship_diff.properties_by_db_id.values():
                     for diff_relationship_property in diff_relationship_property_list:
-                        if diff_relationship_property.changed_at <= self.from_time:
+                        if diff_relationship_property.changed_at >= self.from_time:
                             return
         del self._diff_root_by_branch[self.base_branch_name]
 
diff --git a/backend/infrahub/core/query/diff.py b/backend/infrahub/core/query/diff.py
index ba850353c2..4a20672bf9 100644
--- a/backend/infrahub/core/query/diff.py
+++ b/backend/infrahub/core/query/diff.py
@@ -519,7 +519,7 @@ async def query_init(self, db: InfrahubDatabase, **kwargs):
             MATCH (p)-[diff_rel]-(q)
             WHERE any(l in labels(p) WHERE l in ["Node", "Attribute", "Relationship"])
             AND %(diff_rel_filter)s
-            AND p.branch_support IN $branch_support
+            AND (p.branch_support IN $branch_support OR q.branch_support IN $branch_support)
             AND %(p_node_where)s
             // subqueries to get full paths associated with the above update edges
             WITH p, diff_rel, q
@@ -604,7 +604,7 @@ async def query_init(self, db: InfrahubDatabase, **kwargs):
                     WHERE r.from <= $to_time AND (r.to IS NULL or r.to >= $to_time)
                     AND r.branch IN $branch_names
                 )
-                AND ID(inner_p) <> ID(prop)
+                AND [ID(inner_p), type(inner_diff_rel)] <> [ID(prop), type(r_prop)]
                 WITH path, prop, r_prop, r_root
                 ORDER BY
                     ID(prop),
@@ -635,7 +635,7 @@ async def query_init(self, db: InfrahubDatabase, **kwargs):
                     WHERE r.from <= $to_time AND (r.to IS NULL or r.to >= $to_time)
                     AND r.branch IN $branch_names
                 )
-                AND ID(inner_p) <> ID(prop)
+                AND [ID(inner_p), type(r_node)] <> [ID(prop), type(r_prop)]
                 WITH path, node, prop, r_prop, r_node
                 ORDER BY
                     ID(node),
@@ -644,7 +644,7 @@ async def query_init(self, db: InfrahubDatabase, **kwargs):
                     r_node.branch = diff_rel.branch DESC,
                     r_prop.from DESC,
                     r_node.from DESC
-                WITH node, prop, head(collect(path)) AS latest_path
+                WITH node, prop, type(r_prop) AS r_prop_type, type(r_node) AS r_node_type, head(collect(path)) AS latest_path
                 RETURN latest_path
             }
             WITH p, q, diff_rel, full_diff_paths, collect(latest_path) AS latest_paths
diff --git a/backend/infrahub/core/relationship/model.py b/backend/infrahub/core/relationship/model.py
index d9c8b16dbe..24b8757049 100644
--- a/backend/infrahub/core/relationship/model.py
+++ b/backend/infrahub/core/relationship/model.py
@@ -289,14 +289,21 @@ def get_peer_schema(self, db: InfrahubDatabase) -> MainSchemaTypes:
     def compare_properties_with_data(self, data: RelationshipPeerData) -> list[str]:
         different_properties = []
 
-        for prop_name, prop in data.properties.items():
-            if hasattr(self, "_flag_properties") and prop_name in self._flag_properties:
-                if prop.value != getattr(self, prop_name):
-                    different_properties.append(prop_name)
-
-            elif hasattr(self, "_node_properties") and prop_name in self._node_properties:
-                if prop.value != getattr(self, f"{prop_name}_id"):
-                    different_properties.append(prop_name)
+        if hasattr(self, "_flag_properties"):
+            for property_name in self._flag_properties:
+                memory_value = getattr(self, property_name, None)
+                database_prop = data.properties.get(property_name)
+                database_value = database_prop.value if database_prop else None
+                if memory_value != database_value:
+                    different_properties.append(property_name)
+
+        if hasattr(self, "_node_properties"):
+            for property_name in self._node_properties:
+                memory_value = getattr(self, f"{property_name}_id", None)
+                database_prop = data.properties.get(property_name)
+                database_value = database_prop.value if database_prop else None
+                if memory_value != database_value:
+                    different_properties.append(property_name)
 
         return different_properties
 
diff --git a/backend/tests/unit/core/diff/test_diff_query_parser.py b/backend/tests/unit/core/diff/test_diff_query_parser.py
index 2b72c434e1..d196fc5492 100644
--- a/backend/tests/unit/core/diff/test_diff_query_parser.py
+++ b/backend/tests/unit/core/diff/test_diff_query_parser.py
@@ -590,3 +590,134 @@ async def test_add_node_branch(
         (DatabaseEdgeType.IS_PROTECTED, DiffAction.ADDED, False, None),
         (DatabaseEdgeType.IS_RELATED, DiffAction.ADDED, person_jane_main.id, None),
     }
+
+
+async def test_agnostic_source_relationship_update(
+    db: InfrahubDatabase,
+    default_branch: Branch,
+    car_person_schema_global,
+):
+    person_1 = await Node.init(db=db, schema="TestPerson", branch=default_branch)
+    await person_1.new(db=db, name="Herb", height=165)
+    await person_1.save(db=db)
+    new_car = await Node.init(db=db, branch=default_branch, schema="TestCar")
+    await new_car.new(db=db, name="Batmobile", color="#000000", nbr_seats=1, is_electric=False, owner=person_1)
+    await new_car.save(db=db)
+    branch = await create_branch(db=db, branch_name="branch")
+    from_time = Timestamp(branch.created_at)
+    branch_car = await NodeManager.get_one(db=db, branch=branch, id=new_car.id)
+    await branch_car.owner.update(db=db, data={"id": person_1.id, "_relation__source": person_1.id})
+    await branch_car.save(db=db)
+
+    diff_query = await DiffAllPathsQuery.init(
+        db=db,
+        branch=branch,
+        base_branch=default_branch,
+    )
+    await diff_query.execute(db=db)
+
+    diff_parser = DiffQueryParser(
+        diff_query=diff_query,
+        base_branch_name=default_branch.name,
+        diff_branch_name=branch.name,
+        schema_manager=registry.schema,
+        from_time=from_time,
+    )
+    diff_parser.parse()
+
+    assert diff_parser.get_branches() == {branch.name}
+    root_path = diff_parser.get_diff_root_for_branch(branch=branch.name)
+    assert root_path.branch == branch.name
+    assert len(root_path.nodes) == 1
+    diff_node = root_path.nodes.pop()
+    assert diff_node.uuid == new_car.get_id()
+    assert diff_node.action is DiffAction.UPDATED
+    assert diff_node.attributes == []
+    assert len(diff_node.relationships) == 1
+    diff_relationship = diff_node.relationships.pop()
+    assert diff_relationship.name == "owner"
+    assert diff_relationship.action is DiffAction.UPDATED
+    assert len(diff_relationship.relationships) == 1
+    diff_element = diff_relationship.relationships.pop()
+    assert diff_element.peer_id == person_1.get_id()
+    assert diff_element.action is DiffAction.UPDATED
+    diff_props_by_type = {p.property_type: p for p in diff_element.properties}
+    assert set(diff_props_by_type.keys()) == {DatabaseEdgeType.IS_RELATED, DatabaseEdgeType.HAS_SOURCE}
+    diff_prop_is_related = diff_props_by_type[DatabaseEdgeType.IS_RELATED]
+    assert diff_prop_is_related.previous_value == person_1.get_id()
+    assert diff_prop_is_related.new_value == person_1.get_id()
+    assert diff_prop_is_related.action is DiffAction.UNCHANGED
+    diff_prop_has_source = diff_props_by_type[DatabaseEdgeType.HAS_SOURCE]
+    assert diff_prop_has_source.previous_value is None
+    assert diff_prop_has_source.new_value == person_1.get_id()
+    assert diff_prop_has_source.action is DiffAction.ADDED
+
+
+async def test_agnostic_owner_relationship_added(
+    db: InfrahubDatabase,
+    default_branch: Branch,
+    car_person_schema_global,
+):
+    branch = await create_branch(db=db, branch_name="branch")
+    from_time = Timestamp(branch.created_at)
+    person_1 = await Node.init(db=db, schema="TestPerson", branch=branch)
+    await person_1.new(db=db, name="Herb", height=165)
+    await person_1.save(db=db)
+    new_car = await Node.init(db=db, branch=branch, schema="TestCar")
+    await new_car.new(db=db, name="Batmobile", color="#000000", nbr_seats=1, is_electric=False, owner=person_1)
+    await new_car.owner.update(db=db, data={"id": person_1.id, "_relation__owner": person_1.id})
+    await new_car.save(db=db)
+
+    diff_query = await DiffAllPathsQuery.init(
+        db=db,
+        branch=branch,
+        base_branch=default_branch,
+    )
+    await diff_query.execute(db=db)
+
+    diff_parser = DiffQueryParser(
+        diff_query=diff_query,
+        base_branch_name=default_branch.name,
+        diff_branch_name=branch.name,
+        schema_manager=registry.schema,
+        from_time=from_time,
+    )
+    diff_parser.parse()
+
+    assert diff_parser.get_branches() == {branch.name}
+    root_path = diff_parser.get_diff_root_for_branch(branch=branch.name)
+    assert root_path.branch == branch.name
+    diff_nodes_by_id = {n.uuid: n for n in root_path.nodes}
+    assert set(diff_nodes_by_id.keys()) == {new_car.get_id()}
+    diff_node_car = diff_nodes_by_id[new_car.get_id()]
+    assert diff_node_car.action is DiffAction.ADDED
+    assert {(attr.name, attr.action) for attr in diff_node_car.attributes} == {
+        ("name", DiffAction.ADDED),
+        ("color", DiffAction.ADDED),
+        ("is_electric", DiffAction.ADDED),
+    }
+    assert len(diff_node_car.relationships) == 1
+    diff_relationship = diff_node_car.relationships.pop()
+    assert diff_relationship.name == "owner"
+    assert diff_relationship.action is DiffAction.ADDED
+    assert len(diff_relationship.relationships) == 1
+    diff_element = diff_relationship.relationships.pop()
+    assert diff_element.peer_id == person_1.get_id()
+    assert diff_element.action is DiffAction.ADDED
+    diff_props_by_type = {p.property_type: p for p in diff_element.properties}
+    assert set(diff_props_by_type.keys()) == {
+        DatabaseEdgeType.IS_RELATED,
+        DatabaseEdgeType.HAS_OWNER,
+        DatabaseEdgeType.IS_PROTECTED,
+        DatabaseEdgeType.IS_VISIBLE,
+    }
+    diff_prop_tuples = {
+        (diff_prop.property_type, diff_prop.action, diff_prop.previous_value, diff_prop.new_value)
+        for diff_prop in diff_props_by_type.values()
+    }
+    assert diff_prop_tuples == {
+        (DatabaseEdgeType.IS_RELATED, DiffAction.ADDED, None, person_1.get_id()),
+        (DatabaseEdgeType.HAS_OWNER, DiffAction.ADDED, None, person_1.get_id()),
+        (DatabaseEdgeType.IS_PROTECTED, DiffAction.ADDED, None, False),
+        (DatabaseEdgeType.IS_VISIBLE, DiffAction.ADDED, None, True),
+    }