She is the daughter of your brother
Answer: Niece
He is the son of your parents.
Answer: brother
She is the mother of your husband or wife.
Answer: mother‑in‑law
She is the sister of your mother.
Answer: aunt
He is the husband of your sister.
Answer: brother‑in‑law
He is the son of your aunt or uncle.
Answer: cousin
He is the father of your father.
Answer: grandfather
He is the brother of your mother.
Answer: uncle
She is the wife of your brother.
Answer: sister‑in‑law
He is the father of your husband or wife.
Answer: father‑in‑law
She is the daughter of your parents.
Answer: sister
She is the mother of your mother.
Answer: grandmother
She is the daughter of your aunt or uncle.
Answer: cousin
He is the son of your sister
Answer: Nephew