diff --git a/.gitignore b/.gitignore
index badf168d..f65d4b90 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,8 @@ Makefile
 /src/cg-mwesplit
 /src/cg-proc
 /src/cg-relabel
+/src/cg-annotate
+/src/cg-merge-annotations
 /src/CMakeFiles
 /src/libcg3.1.dylib
 /src/libcg3.dylib
diff --git a/emacs/cg.el b/emacs/cg.el
index 03b0d646..d342d953 100644
--- a/emacs/cg.el
+++ b/emacs/cg.el
@@ -164,7 +164,7 @@ Don't change without re-evaluating `cg-kw-re' (or all of cg.el).")
     "MAP"    "ADD"
     "UNMAP"
     "SELECT" "REMOVE"
-    "SETPARENT"    "SETCHILD"     "REMPARENT"
+    "SETPARENT"    "SETCHILD"     "REMPARENT"    "SWITCHPARENT"
     "ADDRELATION"  "REMRELATION"  "SETRELATION"
     "ADDRELATIONS" "REMRELATIONS" "SETRELATIONS"
     "SETVARIABLE"  "REMVARIABLE"
diff --git a/manual/dependencies.xml b/manual/dependencies.xml
index e0f79f6b..76580102 100644
--- a/manual/dependencies.xml
+++ b/manual/dependencies.xml
@@ -62,7 +62,7 @@
   <section id="dep-remparent">
     <title>REMPARENT</title>
     <indexterm>
-      <primary>SETCHILD</primary>
+      <primary>REMPARENT</primary>
     </indexterm>
     <screen>
       [wordform] REMPARENT &lt;target&gt; [contextual_tests] ;
@@ -75,6 +75,44 @@
     </screen>
   </section>
 
+  <section id="dep-switchparent">
+    <title>SWITCHPARENT</title>
+    <indexterm>
+      <primary>SWITCHPARENT</primary>
+    </indexterm>
+    <screen>
+      [wordform] SWITCHPARENT [WITHCHILD &lt;child_set&gt;] &lt;target&gt; [contextual_tests] ;
+    </screen>
+    <para>
+      Sets the grandparent of the target as its parent and sets the target as the parent of the previous parent. If <link linkend="rule-options-withchild">WTIHCHILD</link> is present, any siblings of the target which match the set will also become children of the target.
+    </para>
+    <screen>
+      "&lt;and&gt;"
+	      "and" CCONJ #1->2
+      "&lt;in&gt;"
+  	    "in" ADP #2->0
+      "&lt;the&gt;"
+	      "the" DET #3->4
+      "&lt;house&gt;"
+	      "house" NOUN #4->2
+      "&lt;.&gt;"
+	      "." PUNCT #5->2
+
+      SWITCHPARENT WITHCHILD (*) - (PUNCT) (NOUN) IF (p (ADP)) ;
+
+      "&lt;and&gt;"
+	      "and" CCONJ #1->4
+      "&lt;in&gt;"
+  	    "in" ADP #2->4
+      "&lt;the&gt;"
+	      "the" DET #3->4
+      "&lt;house&gt;"
+	      "house" NOUN #4->0
+      "&lt;.&gt;"
+	      "." PUNCT #5->2
+    </screen>
+  </section>
+
   <section id="dep-input">
     <title>Existing Trees in Input</title>
     <para>
diff --git a/manual/rules.xml b/manual/rules.xml
index 92aa27c4..e8214146 100644
--- a/manual/rules.xml
+++ b/manual/rules.xml
@@ -40,6 +40,7 @@
       SETCHILD &lt;target&gt; [contextual_tests]
           TO|FROM &lt;contextual_target&gt; [contextual_tests] ;
       REMPARENT &lt;target&gt; [contextual_tests] ;
+      SWITCHPARENT [WITHCHILD &lt;child_set&gt;] &lt;target&gt; [contextual_tests] ;
 
   Relation manipulation:
       ADDRELATION &lt;name&gt; &lt;target&gt; [contextual_tests]
diff --git a/src/GrammarApplicator_runRules.cpp b/src/GrammarApplicator_runRules.cpp
index a58392bc..571901b7 100644
--- a/src/GrammarApplicator_runRules.cpp
+++ b/src/GrammarApplicator_runRules.cpp
@@ -473,7 +473,7 @@ bool GrammarApplicator::runSingleRule(SingleWindow& current, const Rule& rule, R
 		}
 
 		// If this is REMPARENT and there's no parent, skip it.
-		if (type == K_REMPARENT && cohort->dep_parent == DEP_NO_PARENT) {
+		if ((type == K_REMPARENT || type == K_SWITCHPARENT) && cohort->dep_parent == DEP_NO_PARENT) {
 			continue;
 		}
 
@@ -2632,6 +2632,35 @@ uint32_t GrammarApplicator::runRulesOnSingleWindow(SingleWindow& current, const
 				TRACE;
 				get_apply_to().cohort->dep_parent = DEP_NO_PARENT;
 			}
+			else if (rule->type == K_SWITCHPARENT) {
+				// this is a per-cohort rule
+				finish_reading_loop = false;
+				TRACE;
+
+				// collect cohorts
+				Cohort* child = get_apply_to().cohort;
+				Cohort* parent = current.parent->cohort_map[child->dep_parent];
+				auto grandparent_number = parent->dep_parent;
+				CohortSet siblings;
+				collect_subtree(siblings, parent, rule->childset1);
+
+				// clear dependencies
+				child->dep_parent = DEP_NO_PARENT;
+				parent->dep_parent = DEP_NO_PARENT;
+				for (auto s : siblings) {
+					s->dep_parent = DEP_NO_PARENT;
+				}
+
+				// reattach
+				auto it = current.parent->cohort_map.find(grandparent_number);
+				if (it != current.parent->cohort_map.end()) {
+					attachParentChild(*(it->second), *child);
+				}
+				attachParentChild(*child, *parent);
+				for (auto s : siblings) {
+					attachParentChild(*child, *s);
+				}
+			}
 			else if (rule->type == K_MOVE_AFTER || rule->type == K_MOVE_BEFORE || rule->type == K_SWITCH) {
 				// this is a per-cohort rule
 				finish_reading_loop = false;
diff --git a/src/Strings.hpp b/src/Strings.hpp
index 07c08196..7dce3b8f 100644
--- a/src/Strings.hpp
+++ b/src/Strings.hpp
@@ -97,6 +97,7 @@ enum KEYWORDS : uint32_t {
 	K_CMDARGS_OVERRIDE,
 	K_COPYCOHORT,
 	K_REMPARENT,
+	K_SWITCHPARENT,
 	KEYWORD_COUNT,
 };
 
@@ -263,6 +264,7 @@ constexpr UStringView keywords[KEYWORD_COUNT] = {
 	u"CMDARGS-OVERRIDE",
 	u"COPYCOHORT",
 	u"REMPARENT",
+	u"SWITCHPARENT",
 };
 
 constexpr UStringView stringbits[] = {
diff --git a/src/TextualParser.cpp b/src/TextualParser.cpp
index 5cab7fde..197d8d50 100644
--- a/src/TextualParser.cpp
+++ b/src/TextualParser.cpp
@@ -1691,6 +1691,10 @@ bool TextualParser::maybeParseRule(UChar*& p) {
 	else if (IS_ICASE(p, "REMPARENT", "remparent")) {
 		parseRule(p, K_REMPARENT);
 	}
+	// SWITCHPARENT
+	else if (IS_ICASE(p, "SWITCHPARENT", "switchparent")) {
+		parseRule(p, K_SWITCHPARENT);
+	}
 	// RESTORE
 	else if (IS_ICASE(p, "RESTORE", "restore")) {
 		parseRule(p, K_RESTORE);
diff --git a/test/T_SwitchParent/expected.txt b/test/T_SwitchParent/expected.txt
new file mode 100644
index 00000000..11b68ddf
--- /dev/null
+++ b/test/T_SwitchParent/expected.txt
@@ -0,0 +1,36 @@
+"<and>"
+	"and" CCONJ #1->4
+"<in>"
+	"in" ADP #2->4
+"<the>"
+	"the" DET #3->4
+"<house>"
+	"house" NOUN #4->0
+"<.>"
+	"." PUNCT #5->2
+
+"<there>"
+	"there" PRON #1->0
+"<and>"
+	"and" CCONJ #2->5
+"<in>"
+	"in" ADP #3->5
+"<the>"
+	"the" DET #4->5
+"<house>"
+	"house" NOUN #5->1
+"<.>"
+	"." PUNCT #6->3
+
+"<there>"
+	"there" PRON #1->0
+"<and>"
+	"and" CCONJ #2->5
+"<in>"
+	"in" ADP #3->5
+"<the>"
+	"the" DET #4->5
+"<house>"
+	"house" NOUN #5->5
+"<.>"
+	"." PUNCT #6->3
diff --git a/test/T_SwitchParent/grammar.cg3 b/test/T_SwitchParent/grammar.cg3
new file mode 100644
index 00000000..15b572ae
--- /dev/null
+++ b/test/T_SwitchParent/grammar.cg3
@@ -0,0 +1,4 @@
+CMDARGS += -D ;
+DELIMITERS = "<.>" ;
+
+SWITCHPARENT WITHCHILD (*) - (PUNCT) (NOUN) IF (p (ADP)) ;
diff --git a/test/T_SwitchParent/input.txt b/test/T_SwitchParent/input.txt
new file mode 100644
index 00000000..50839e27
--- /dev/null
+++ b/test/T_SwitchParent/input.txt
@@ -0,0 +1,36 @@
+"<and>"
+	"and" CCONJ #1->2
+"<in>"
+	"in" ADP #2->0
+"<the>"
+	"the" DET #3->4
+"<house>"
+	"house" NOUN #4->2
+"<.>"
+	"." PUNCT #5->2
+
+"<there>"
+	"there" PRON #1->0
+"<and>"
+	"and" CCONJ #2->3
+"<in>"
+	"in" ADP #3->1
+"<the>"
+	"the" DET #4->5
+"<house>"
+	"house" NOUN #5->3
+"<.>"
+	"." PUNCT #6->3
+
+"<there>"
+	"there" PRON #1->0
+"<and>"
+	"and" CCONJ #2->3
+"<in>"
+	"in" ADP #3->3
+"<the>"
+	"the" DET #4->5
+"<house>"
+	"house" NOUN #5->3
+"<.>"
+	"." PUNCT #6->3