We would infact, cll our sisters son your nephew and they would call you either auntie or uncle depending on your sex.
Probably your niece-in-law.
cousin brother
Your uncle's wife is your aunt. Her sister is not related to you and neither is the sister's son.
Son-in-law.
Great nephew
nephew
A siblings son is always called a nephew
Your nephew
cousin
Your sisters son is your nephew.
Uncle or Auntie.
If your sister had a son, then he is your nephew.
Your sister's son is your nephew.
If you are the daughter or son of your mother then ALL her sisters are your aunts no matter what their age.
Your sister's son is your nephew.
No, making your son wear his sisters pants is not a good punishment.