My cousin has a newish BF who will of course be invited. I think (I'm going to ask closer to when invites go out) that the new bf has a couple kids. My cousin also has a son. My cousin's son will be invited but do I need to invite the bf's kids? I'm obviously not having a kids free wedding but ya gotta draw the line somewhere. At this point its kids of family and our RB (our friends' son).
Also how should I address this invitation?
Miss Jane Doe
Johnny Doe
Mr. James Smith?