cousins!!
aunt uncle etc.
Aunt, Uncle, Grandmother, Grandfather, Cousin
'Great aunt' and 'Great uncle' are what your children properly call your own aunt and uncle. Your aunt and uncle are the brother and sister of your parent. Your parent is your children's grandparent.
You are a great great Aunt (or Uncle) to the grandson of your Nephew.
Great Aunt/Uncle
Your uncle or aunt's children are called your cousins.
"Tía" means Aunt in Spanish. "Tío" means Uncle.
Tia means Princess
Your neice's children are your grandneices and grandnephews. You are their great aunt or great uncle.
Only if they have children.
Your aunt marrying your friend's uncle does not make you and your friend blood relatives. I don't think there would be a problem with you and your friend marrying.
Your aunt's husband is your uncle. You are his nephew if you are a boy, niece if you are a girl.