diff --git a/packages/react-native/Libraries/ReactNative/RendererImplementation.js b/packages/react-native/Libraries/ReactNative/RendererImplementation.js
index 8bc7500a1c..c55f938a26 100644
--- a/packages/react-native/Libraries/ReactNative/RendererImplementation.js
+++ b/packages/react-native/Libraries/ReactNative/RendererImplementation.js
@@ -9,6 +9,7 @@
  */
 
 import type {HostComponent} from '../Renderer/shims/ReactNativeTypes';
+import type ReactFabricHostComponent from './ReactFabricPublicInstance/ReactFabricHostComponent';
 import type {Element, ElementRef, ElementType} from 'react';
 
 import {type RootTag} from './RootTag';
@@ -110,3 +111,13 @@ export function unstable_batchedUpdates<T>(
 export function isProfilingRenderer(): boolean {
   return Boolean(__DEV__);
 }
+
+export function isChildPublicInstance(
+  parentInstance: ReactFabricHostComponent | HostComponent<mixed>,
+  childInstance: ReactFabricHostComponent | HostComponent<mixed>,
+): boolean {
+  return require('../Renderer/shims/ReactNative').isChildPublicInstance(
+    parentInstance,
+    childInstance,
+  );
+}