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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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13y ago
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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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Related questions

What relationship is brother of mother-in law to you and also his sons and daughters to you?

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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Children of sisters are first cousins. Grandchildren of sisters are second cousins. Great grandshildren of sisters are third cousins.


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Your sister-in-laws are your sisters by law after marriage. They are either your spouse's sisters, or the wives of your brothers. Their relatives are not related to you, although some of them will be related to your children.


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I think they would be 3rd cousins


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