diff --git a/music_kraken/objects/parents.py b/music_kraken/objects/parents.py
index a0bad1e..d80cd23 100644
--- a/music_kraken/objects/parents.py
+++ b/music_kraken/objects/parents.py
@@ -34,10 +34,6 @@ class InnerData:
         self._refers_to_instances = set()
         self._fetched_from: dict = {}
 
-        # collection : collection that is a collection of self
-        self._is_collection_child: Dict[Collection, Collection] = {}
-        self._is_collection_parent: Dict[Collection, Collection] = {}
-        
         # initialize the default values
         self._default_values = {}
         for name, factory in object_type._default_factories.items():
@@ -201,18 +197,6 @@ class OuterProxy:
             a, b = b, a
 
         object_trace(f"merging {type(a).__name__} [{a.title_string} | {a.id}] with {type(b).__name__} [{b.title_string} | {b.id}]")
-        
-        for collection, child_collection in b._inner._is_collection_child.items():
-            try:
-                collection.children.remove(child_collection)
-            except ValueError:
-                pass
-            
-        for collection, parent_collection in b._inner._is_collection_parent.items():
-            try:
-                collection.parents.remove(parent_collection)
-            except ValueError:
-                pass
 
         old_inner = b._inner