What relation is your aunt's husband's sister's daughter to you?

Answer 1

Your aunt is either your parent's sister or the wife of your parent's brother.

If she is your parent's sister, her husband, his sister and her daughter are not related to you.

If your aunt is the wife of your parent's brother, then her husband's sister is your mother (and her daughter is you or your sister) or she is another of your aunts (and her daughter is your first cousin).

Answer 2

Your grandmother's aunt is the sister of your grandmother's father or mother, and her daughter is your grandmother's First Cousin. That daughter is thereforeyour First Cousin, Twice Removed.