The daughter of your husband's brother is your niece.
Your wife's sister's daughter's son (your wife's sister's grandson) is your ( and your wife's) great nephew. The two of you are his great aunt and great uncle.
Your niece and nephew.
If you have no siblings but your daughter has an uncle, he is the brother of your spouse, your brother-in-law.
Your daughter's son is your grandson and you are his grandparent.
Your daughter and your sister's son are first cousins to each other. Your sister's son's daughter (her granddaughter) and your daughter are first cousins, once removed.
A son's wife is called your daughter-in-law.
granddaughter
You would call your sister's son your nefu and her daughter neice.
Your uncle would be your sons great uncle. Normally your Son would also call him 'Uncle .... '
what would my sister's son's daughter be to me? Your sisters son is of course your nephew,You are his Aunt... Your Nephews daughter would be your great-neice,you would be her great-Aunt.
You would call your daughter's son by his name ex: Hi Jack.
Your sister's daughter's son would be your grandnephew.
His name.
Your daughter is your sister's niece. Your daughter's son is her great nephew.
nephew
daughter...daughter in law.
Your younger brother's wife's sister's daughter would be your son's cousin.
Your grandson.