First cousins once removed. They would be your parent's cousin.
My ancestors
If she's not your mother, that would make her your Aunt.
you will be his great great grand son/daughter..:)
go ahead if you want to marry your aunt
There is no word in the English language for a relationship between grandmothers of related grandchildren
First cousins twice removed.
If your great great grandmothers were sisters, your common ancestors are your great great great grandparents. That makes you 4th cousins.
Hopefully, women who are grandmothers of the same children are friends, but in western culture they are not otherwise related. They are the mothers of the parents of the children
You are not related as you do not share a common ancestor.
If you have no siblings but your daughter has an uncle, he is the brother of your spouse, your brother-in-law.
Your great grandmother's brother is your great great uncle. Your parent and the grandson of your great great uncle are Second Cousins. Therefore you and the grandson of your great great uncle are Second Cousins, once removed.
Your cousin's wife is not related to you or to your daughter - unless your daughter marries their son or your wife is related to your cousin's wife.