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Your sister's son' son is her grandson. Your sister's grandson is your great nephew. You are his great uncle or great aunt.

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Wiki User

14y ago

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More answers

Shout out their name and if they here you they'll probably answer

or you could call them on their phone

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Wiki User

13y ago
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In most families they would call you aunt or uncle. It would technically be great aunt or great uncle.

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Wiki User

10y ago
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A nephew-In-Law.

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Wiki User

12y ago
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Q: How do you call your sister's son's son?
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