diff --git a/Source/UI/Window/WindowAncestry.h b/Source/UI/Window/WindowAncestry.h
deleted file mode 100644
index e995082..0000000
--- a/Source/UI/Window/WindowAncestry.h
+++ /dev/null
@@ -1,16 +0,0 @@
-#ifndef RAGNAROK_SOURCE_UI_WINDOW_WINDOWANCESTRY_H
-#define RAGNAROK_SOURCE_UI_WINDOW_WINDOWANCESTRY_H
-
-struct WindowAncestry {
-  /* 0010 */ WindowAncestry* parent;
-
-  WindowAncestry();
-  bool IsDescendantOf(const WindowAncestry* ancestor) const;
-};
-
-void ForgetWindowReferences(
-  WindowAncestry* removed, WindowAncestry*& reference_019C, WindowAncestry*& reference_01A0, WindowAncestry*& reference_01B8, WindowAncestry*& reference_0A30,
-  WindowAncestry*& reference_4F1D4
-);
-
-#endif