What Is My Sister-in-law Granddaughter To Me?

What Is My Sister-in-law Granddaughter To Me? The daughter of one’s brother-in-law or sister-in-law. The definition of niece is the daughter of your brother or sister, by blood or by marriage. What relation is my sister’s grandchild to me? Your sisters grandkids are your grand nieces and nephews. Their parents your sister’s children are your