your niece
Your aunt's granddaughter is your first cousin once removed.
Your uncle's granddaughter and your child are second cousins.
You granddaughter is a great great niece of your aunt. Your aunt is your granddaughter's great great aunt.
Your first cousin.
Great neice
No relationship at all, you don't share a common ancestor.
Your granddaughter and grand niece are second cousins to each other.
Your great nephew and your granddaughter are second cousins to each other.
No. The sister is a relation, and her husband is an in-law. The husband's brother is no biological relation either. Therefore, the great granddaughter of the husband's brother is not a relation.
First cousins, twice removed. Aunts daughter is your cousin. Aunts daughters daughter is cousin once removed Aunts daughters daughters daughter is cousin twice removed.
Great niece
Your granddaughter and your grandniece are second cousins or third cousins to each other