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"TypeOf...Is Child" from Parent causes broken Excel file

VBA does not support class polymorphism.

I think you are misunderstanding the purpose of the keyword Implements.

It's used when you want a class to implement an Interface - not another class ( well, at least not literally because an Interface in VBA is another class module object )

See this answer for better understanding of the Implements keyword in VBA

Also refer to this for info about VBA polymorphism

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