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I believe they would be great aunts or great uncles.
What else can I help you with?
My sister's daughters children?
They are your grand-nephews and grand-nieces or great-nephews and great-nieces.
What are your nieces children to you?
Your niece's children are your great nieces and great nephews.
What do you call your husbands sisters kids who have kids?
The children of your husband's siblings are your nieces or nephews. Their children are your great-nieces or great-nephews.
What do you call your brother's child's children?
Your brother's children would be your nieces and nephews. Your nephew's children would be great-nieces and great-nephews.
What do you call your children?
Some would call your nephew's children your grand nephews and grand nieces, others would call then your great nephews and great nieces.
What would your nephews kid be to you?
Your nephew's children are your great nephews and great nieces (or grand nephews and grand nieces).
What relation is my brother's children to me?
Your borther-in-law's children are your nieces and nephews. You are their uncle or aunt, as is your spouse.
What relation is your sisters daughters children to you?
They would be great nieces or great nephews.
What relationship is your great nephew's children to you?
Your great nephew's children are your great great nieces and great great nephews. You are their great great aunt or great great uncle.
What is the relationship of your child's children to your great nieces and nephews?
Second cousins.
What relationship is your great great nephew to your children?
Your great nephew's children are your great great nieces and great great nephews. You are their great great aunt or great great uncle.
Are your sister's children's children related to you?
Your mother's sister's children are your 1st cousins.
