Like Uncle, Like Nephew

Isn't it just mind boggling how the most bizarre things are hereditary? For example...
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Take 1:

Take 2:

Take 3:

And finally, take 4 (after a very shrill "Aaaannndrewwww, COOPERATE!!!):
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Take 1:

Take 2:
Take 3:
And finally, take 4 (after bribing him that I'd race him to the park if he'd smile normal):