If she's not your mother, that would make her your Aunt.
3rd cousin I think:-)
Mother's grandson as regards her daughter is either her (daughter's) son or her (daughter's) nephew.
If you have no siblings but your daughter has an uncle, he is the brother of your spouse, your brother-in-law.
Through marriage your step - sister's daughter is your step-niece!
Your nephew's daughter is your great niece and you are her great Aunt (or Great Uncle).Correction:Your nephew's daughter is your grand niece. You are her grand aunt or grand uncle.
you are second cousins.
There is no relation between you and your grandmother's cousin-in-law's grandson.
My ancestors
You are not related as you do not share a common ancestor.
you will be his great great grand son/daughter..:)
go ahead if you want to marry your aunt
First cousins twice removed.
First cousins once removed. They would be your parent's cousin.
your brother's daughter is you niece
Your aunt's daughter is your first cousin.
your not your daughter is by marriage you are not
Your brother's daughter is your niece. Her daughter is your great niece.