no realtion, I think
Your mother's son is your brother or your half brother.
If it was a boy then he would be your sons half brother and if it was a girl she would be your sons half sister.
Your wife's brother's son would be your nephew...
Your son's wife is your daughter-in-law. Her brother is your son's brother-in-law, but the English language has no word for a relationship between you and him. You are not considered to be related to him.
your son and your brother's son will be cousins
your son is your brother's nephew, and your brother is your son's uncle
Your half-brother's daughter is your niece. Your niece and your son are first cousins to each other.
your son and your brother's son will be cousins
I think that would be your cousin.
Your brother would be your son's daughter's great uncle and your son's daughter would be your brothers great niece! Hopefully that makes sense :)
your son and your brother's son will be cousins
Your sister's son's son is her grandson.Your sister's son and your brother's son are first cousins.Your sister's grandson and your brother's son are first cousins, once removed.