diff --git a/Package.resolved b/Package.resolved
index a792ce23..25a2bd3e 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -1,5 +1,5 @@
 {
-  "originHash" : "388a5c22c69d82c7f6b3b006c51d450c398ee78df767269226a0294ec043c444",
+  "originHash" : "9a0c6977a60be4c351b05b7d8aab7de908342d5638eaaadf034c914fbe903558",
   "pins" : [
     {
       "identity" : "darwinprivateframeworks",
@@ -7,7 +7,7 @@
       "location" : "https://github.com/OpenSwiftUIProject/DarwinPrivateFrameworks.git",
       "state" : {
         "branch" : "main",
-        "revision" : "082d0abd12876636df553723e22a395a881f5491"
+        "revision" : "27cecdd28a2ec028d7cb80de45ebc641a4eac1f7"
       }
     },
     {
diff --git a/Sources/OpenAttributeGraphCxx/Graph/OAGGraph.cpp b/Sources/OpenAttributeGraphCxx/Graph/OAGGraph.cpp
index 2bab8c2c..b7c4f661 100644
--- a/Sources/OpenAttributeGraphCxx/Graph/OAGGraph.cpp
+++ b/Sources/OpenAttributeGraphCxx/Graph/OAGGraph.cpp
@@ -209,3 +209,12 @@ bool OAGGraphAnyInputsChanged(const OAGAttribute *excluded_inputs, size_t count)
     // TODO
     return false;
 }
+
+bool OAGGraphBeginDeferringSubgraphInvalidation(OAGGraphRef graph) {
+    // TODO
+    return false;
+}
+
+void OAGGraphEndDeferringSubgraphInvalidation(OAGGraphRef graph, bool was_deferring) {
+    // TODO
+}
diff --git a/Sources/OpenAttributeGraphCxx/Graph/OAGSubgraph.cpp b/Sources/OpenAttributeGraphCxx/Graph/OAGSubgraph.cpp
index 45896a47..4b24503e 100644
--- a/Sources/OpenAttributeGraphCxx/Graph/OAGSubgraph.cpp
+++ b/Sources/OpenAttributeGraphCxx/Graph/OAGSubgraph.cpp
@@ -136,6 +136,31 @@ void OAGSubgraphRemoveChild(OAGSubgraphRef parent, OAGSubgraphRef child) {
     // TODO
 }
 
+OAGSubgraphRef OAGSubgraphGetChild(OAGSubgraphRef cf_subgraph, uint32_t index, uint8_t *_Nullable tag_out) {
+    // TODO
+    return nullptr;
+}
+
+uint32_t OAGSubgraphGetChildCount(OAGSubgraphRef cf_subgraph) {
+    // TODO
+    return 0;
+}
+
+OAGSubgraphRef OAGSubgraphGetParent(OAGSubgraphRef cf_subgraph, int64_t index) {
+    // TODO
+    return nullptr;
+}
+
+uint64_t OAGSubgraphGetParentCount(OAGSubgraphRef cf_subgraph) {
+    // TODO
+    return 0;
+}
+
+bool OAGSubgraphIsAncestor(OAGSubgraphRef cf_subgraph, OAGSubgraphRef other) {
+    // TODO
+    return false;
+}
+
 void OAGSubgraphApply(OAGSubgraphRef cf_subgraph,
                      OAGAttributeFlags flags,
                      const void (*function)(const void * _Nullable context OAG_SWIFT_CONTEXT, OAGAttribute attribute) OAG_SWIFT_CC(swift),
diff --git a/Sources/OpenAttributeGraphCxx/include/OpenAttributeGraph/OAGGraph.h b/Sources/OpenAttributeGraphCxx/include/OpenAttributeGraph/OAGGraph.h
index bda9886e..1c47b566 100644
--- a/Sources/OpenAttributeGraphCxx/include/OpenAttributeGraph/OAGGraph.h
+++ b/Sources/OpenAttributeGraphCxx/include/OpenAttributeGraph/OAGGraph.h
@@ -114,6 +114,14 @@ OAG_REFINED_FOR_SWIFT
 bool OAGGraphAnyInputsChanged(const OAGAttribute *excluded_inputs, size_t count);
 #endif
 
+OAG_EXPORT
+OAG_REFINED_FOR_SWIFT
+bool OAGGraphBeginDeferringSubgraphInvalidation(OAGGraphRef graph) OAG_SWIFT_NAME(OAGGraphRef.beginDeferringSubgraphInvalidation(self:));
+
+OAG_EXPORT
+OAG_REFINED_FOR_SWIFT
+void OAGGraphEndDeferringSubgraphInvalidation(OAGGraphRef graph, bool was_deferring) OAG_SWIFT_NAME(OAGGraphRef.endDeferringSubgraphInvalidation(self:wasDeferring:));
+
 OAG_EXTERN_C_END
 
 OAG_IMPLICIT_BRIDGING_DISABLED
diff --git a/Sources/OpenAttributeGraphCxx/include/OpenAttributeGraph/OAGSubgraph.h b/Sources/OpenAttributeGraphCxx/include/OpenAttributeGraph/OAGSubgraph.h
index a6558360..e49efa4c 100644
--- a/Sources/OpenAttributeGraphCxx/include/OpenAttributeGraph/OAGSubgraph.h
+++ b/Sources/OpenAttributeGraphCxx/include/OpenAttributeGraph/OAGSubgraph.h
@@ -22,7 +22,7 @@ OAG_EXTERN_C_BEGIN
 
 OAG_EXPORT
 OAG_REFINED_FOR_SWIFT
-CFTypeID OAGSubgraphGetTypeID();
+CFTypeID OAGSubgraphGetTypeID(void) OAG_SWIFT_NAME(getter:OAGSubgraphRef.typeID());
 
 OAG_EXPORT
 OAG_REFINED_FOR_SWIFT
@@ -68,6 +68,26 @@ OAG_EXPORT
 OAG_REFINED_FOR_SWIFT
 void OAGSubgraphRemoveChild(OAGSubgraphRef parent, OAGSubgraphRef child) OAG_SWIFT_NAME(OAGSubgraphRef.removeChild(self:_:));
 
+OAG_EXPORT
+OAG_REFINED_FOR_SWIFT
+OAGSubgraphRef OAGSubgraphGetChild(OAGSubgraphRef cf_subgraph, uint32_t index, uint8_t *_Nullable tag_out) OAG_SWIFT_NAME(OAGSubgraphRef.child(self:at:tag:));
+
+OAG_EXPORT
+OAG_REFINED_FOR_SWIFT
+uint32_t OAGSubgraphGetChildCount(OAGSubgraphRef cf_subgraph) OAG_SWIFT_NAME(getter:OAGSubgraphRef.childCount(self:));
+
+OAG_EXPORT
+OAG_REFINED_FOR_SWIFT
+OAGSubgraphRef OAGSubgraphGetParent(OAGSubgraphRef cf_subgraph, int64_t index) OAG_SWIFT_NAME(OAGSubgraphRef.parent(self:at:));
+
+OAG_EXPORT
+OAG_REFINED_FOR_SWIFT
+uint64_t OAGSubgraphGetParentCount(OAGSubgraphRef cf_subgraph) OAG_SWIFT_NAME(getter:OAGSubgraphRef.parentCount(self:));
+
+OAG_EXPORT
+OAG_REFINED_FOR_SWIFT
+bool OAGSubgraphIsAncestor(OAGSubgraphRef cf_subgraph, OAGSubgraphRef other) OAG_SWIFT_NAME(OAGSubgraphRef.isAncestor(self:of:));
+
 OAG_EXPORT
 OAG_REFINED_FOR_SWIFT
 bool OAGSubgraphIntersects(OAGSubgraphRef subgraph, OAGAttributeFlags flags) OAG_SWIFT_NAME(OAGSubgraphRef.intersects(self:flags:));
diff --git a/Tests/OpenAttributeGraphCompatibilityTests/Graph/GraphCompatibilityTests.swift b/Tests/OpenAttributeGraphCompatibilityTests/Graph/GraphCompatibilityTests.swift
index ad3b0613..e77e641a 100644
--- a/Tests/OpenAttributeGraphCompatibilityTests/Graph/GraphCompatibilityTests.swift
+++ b/Tests/OpenAttributeGraphCompatibilityTests/Graph/GraphCompatibilityTests.swift
@@ -85,4 +85,18 @@ struct GraphCompatibilityTests {
         #expect(graph.mainUpdates == 0)
     }
     #endif
+    
+    @Test(.disabled(if: !compatibilityTestEnabled, "Not implemented on OAG"))
+    func beginDeferringSubgraphInvalidation() {
+        let graph = Graph()
+        
+        let wasDeferring1 = graph.beginDeferringSubgraphInvalidation()
+        #expect(wasDeferring1 == false)
+        
+        let wasDeferring2 = graph.beginDeferringSubgraphInvalidation()
+        #expect(wasDeferring2 == true)
+        
+        graph.endDeferringSubgraphInvalidation(wasDeferring: wasDeferring2)
+        graph.endDeferringSubgraphInvalidation(wasDeferring: wasDeferring1)
+    }
 }
diff --git a/Tests/OpenAttributeGraphCompatibilityTests/Graph/SubgraphCompatibilityTests.swift b/Tests/OpenAttributeGraphCompatibilityTests/Graph/SubgraphCompatibilityTests.swift
index b08dd697..ed0bc3c8 100644
--- a/Tests/OpenAttributeGraphCompatibilityTests/Graph/SubgraphCompatibilityTests.swift
+++ b/Tests/OpenAttributeGraphCompatibilityTests/Graph/SubgraphCompatibilityTests.swift
@@ -76,4 +76,56 @@ struct SubgraphCompatibilityTests {
             #expect(notifiedCount == 0)
         }
     }
+
+    @MainActor
+    @Suite // Both ConditionTrait and GraphEnvironmentTrait's isRecursive are true
+    struct ChildrenTests {
+        @Test
+        func addChild() {
+            let graph = Graph()
+            let subgraph = Subgraph(graph: graph)
+            let child = Subgraph(graph: graph)
+
+            subgraph.addChild(child)
+            #expect(subgraph.childCount == 1)
+            #expect(subgraph.isAncestor(of: child) == true)
+
+            #expect(subgraph.child(at: 0, tag: nil) === child)
+
+            #expect(child.parentCount == 1)
+            #expect(child.parent(at: 0) === subgraph)
+        }
+
+        @Test
+        func addChildWithTag() {
+            let graph = Graph()
+            let subgraph = Subgraph(graph: graph)
+            let child = Subgraph(graph: graph)
+
+            subgraph.addChild(child, tag: 1)
+            #expect(subgraph.childCount == 1)
+            #expect(subgraph.isAncestor(of: child) == true)
+
+            var tag = 0
+            #expect(subgraph.child(at: 0, tag: &tag) === child)
+            #expect(tag == 1)
+
+            #expect(child.parentCount == 1)
+            #expect(child.parent(at: 0) === subgraph)
+        }
+
+        @Test
+        func removeChild() {
+            let graph = Graph()
+            let subgraph = Subgraph(graph: graph)
+            let child = Subgraph(graph: graph)
+
+            subgraph.addChild(child)
+            subgraph.removeChild(child)
+            #expect(subgraph.childCount == 0)
+            #expect(subgraph.isAncestor(of: child) == false)
+
+            #expect(child.parentCount == 0)
+        }
+    }
 }