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Your sister's children's children are her grandchildren.

Your children and your sister's grand children are first cousins, once removed.

Your grandchildren and your sister's grandchildren are second cousins.

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14y ago
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Wiki User

15y ago

grandniece and/or grandnephew

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Q: How are your children related to your sister's children's children?
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Your mother-in-law's brother and his children are not related to you.He is your childrens' uncle and his children are first cousins to your children.


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