Painful Transformation has these relationships to other tropes:

parents kids shares a parent with:
Body Horror
Shape Shifting
parent child
Body HorrorEye Scream
''Tongue Trauma
''Nightmare Face
''Mutilation Interrogation
''Lovecraftian Superpower
Shape ShiftingDual Age Modes
''Older Alter Ego
''Involuntary Shapeshifter
''Our Werebeasts Are Different
''Skin Walker
''Swiss Army Hero
''Voluntary Shapeshifting
''Shape Shifter Mashup
ShapeshiftingPartial Transformation
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