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Your granddaughter's husband might be called your grandson-in-law, although the term is rarely used. Hissister is your granddaughter's sister-in-law, but is not related to you.

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12y ago
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14y ago

Nothing in blood. She would be considered her Great Aunt. Your granddaughter is your wife's sister's great niece. Your wife's sister is your granddaughter's great aunt.

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11y ago

Your sister in law is an "aunt" by marriage to your children.

Your sister in law is a "great aunt" by marriage to your grandchildren.

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7y ago

He could be the father or the uncle of you and your wife's granddaughter.

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13y ago

Your granddaughter is the great great niece of your father's sister-in-law and her husband.

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Q: What relation is your grandaughter to your sister-in-law?
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