diff --git a/manimlib/mobject/mobject.py b/manimlib/mobject/mobject.py
index 23389bf0..5e031e97 100644
--- a/manimlib/mobject/mobject.py
+++ b/manimlib/mobject/mobject.py
@@ -394,6 +394,7 @@ class Mobject(object):
         if self in old_submob.parents:
             old_submob.parents.remove(self)
         self.submobjects[index] = new_submob
+        new_submob.parents.append(self)
         self.assemble_family()
         return self