What is the relationship of your sister and your grandson?
Your sister would be your grandson's great aunt.
What relationship is your sister to your grandson?
Your sister is your grandson's great aunt. He is her great nephew.
What is your relationship with the grandson of your first cousin three times removed?
Depending on whether you are a member of the older or younger generation in the relationship, the grandson of your first cousin three times removed is either: your first cousin six times removed (y...
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What is the relationship of your sister's child and your grandson?
Your sister's child and your grandson are first cousins once removed.
What is your relationship to your father's cousin's grandson?
Your father's first cousin's daughter or son is your second cousin. Your father's first cousin's grandson is your second cousin once removed. The parent of that grandson is your second cousin.