If your sister-in-law is the sister of your spouse, her son is not related to your sister's son. If your sister-in-law is the wife of your brother, her son and your sister's son are first cousins.
Your sister's son is not related to your husband's sister's son, because they share no common ancestor.
Your sister is your son's aunt. Your sister's daughter is your sons first cousin. Your sister's daughter's son (your sister's grandson) is your son's first cousin, once removed.
No. Your sister's husband is your brother-in-law, but his sister (and her son) are not related to you. However, that son is your sister's nephew.
Your sister is your son's aunt. Your sister's daughter is your sons first cousin. Your sister's daughter's son (your sister's grandson) is your son's first cousin, once removed.
Your sister's son, is your nephew.
Your husband's sister's son is your nephew, just as your sister's son is your nephew.
Your sister's son is your nephew. You are his uncle if you are a man, or his aunt if you are a woman. Your sister's son is your nephew.
Your sister's son' son is her grandson. Your sister's grandson is your great nephew. You are his great uncle or great aunt.
Your sister's son, is your nephew.
Her father, unless the son and his sister have different fathers which would make him nothing to his son's sister.
Yes, for a nephew is sister's son, brother's son, wife's brother's son, wife's sister's son, husband's brother's son, husband's sister's son