So here's the situation. FSIL who's a BM (not sure if that makes a difference for this story) is 18 and has been dating her BF for a year or so. They all live in MD by the way. Per her parents, her BF was not invited to the wedding. He really hasn't been integrated into any other family functions (except her graduation party) and he doesn't really make an effort (at least from what I've seen) to get to know her family. So basically neither side is really putting the effort in to get to know the other. So needless to say FSIL is pissed that he's not invited. FI and I see both sides of the story but we're trying to decide if we should talk to FILs and convince them that he should be invited or if we should just stay out of it. WWYD?