It will only be weird during extended family gatherings.
When you are alone, enjoying a great night with him, it'll mean nothing more than you and him make it mean.
no problem man! enjoy
You nasty!
No.
Uncle or Auntie.
Your sister's son is your nephew and you are his aunt (if you are female) or his uncle (if you are male.
As long as they don't get married. Sure.
That's not a Weird Al song.
he does not have a son he has a seven year old daughter
Your sister's son is your nephew.
No, making your son wear his sisters pants is not a good punishment.
Cousin
He is your cousin