Your granddaughter's husband might be called your grandson-in-law, although the term is rarely used. Hissister is your granddaughter's sister-in-law, but is not related to you.
Nothing in blood. She would be considered her Great Aunt. Your granddaughter is your wife's sister's great niece. Your wife's sister is your granddaughter's great aunt.
Your sister in law is an "aunt" by marriage to your children.
Your sister in law is a "great aunt" by marriage to your grandchildren.
He could be the father or the uncle of you and your wife's granddaughter.
Your granddaughter is the great great niece of your father's sister-in-law and her husband.
First cousin once removed.
a cow
grandaughter
Your daughter and your sister's child are first cousins. Your daughter and your sister's grandchild are first cousins, once removed.
Grandaughter
Your child and your great nephew's parents would be first cousins. Their children would then be second cousins. And if they have children, they will be third cousins.
Your grandaughter would call your brother her great uncle.
manslaughter
Neptis.
ljuba
Enkelin
"Cogratulations on your new grandaughter" in Polish is "Wszystkiego najlepszego z okazji narodzin wnuczki".