There is no relationship. Most families would refer to her as a cousin, or my cousin's wife.
You know, Angie, it's rude to erase someone else's answer and put your own in.
Your grandson is your cousin's wife's 1st cousin 3 times removed by marriage. (but usually the by marriage part is left out, I'm just being official.)
I actually am correct, Angie.
Cousine
Your granddaughter and your sister's grandson are second cousins.
Your first cousin is your son's first cousin once removed.
Your son and your nephew are first cousins to each other. Their daughters are second cousins to each other.
Your uncle's wife's brother's son shares no ancestors with you and so is not related to you - unless the brother is married to one of your cousins.
Your father's first cousin's son is your second cousin. Your father's second cousin's son is your third cousin. If your are asking about your fathers cousins who are in a removed cousin relationship to your father, their relationship to you be more complex, with two different possibilities in each case.
You and your first cousin's son are first cousins, once removed.
This is if you are first cousins. They would be your first cousin once removed. Since the child of your cousin is a generation away from you they are the once removed.
your son and your brother's son will be cousins
They would be 3rd cousins.Grandma-GrandpaMom-Auntyou-cousinson-3nd cousinthe diagram is supposed to show that if your cousin has a baby it would be your son's 3rd cousin because your cousin would be his 2nd cousin.
your son and your brother's son will be cousins
your son and your brother's son will be cousins