Firstly and thankfully we don’t live close to in-laws anymore, but I am wondering how you all would handle this situation.
Several years ago my sister-in-law was 15 and started dating a guy who was 33 (don’t even get me started on how disturbed DH and I were). My husband talked to his sister and the guy but my mother-in-law didn’t do anything to stop the interaction (and in fact admitted she didn’t want to fight, or in my opinion be a parent). So because mom-in-law didn’t do anything there was really nothing we could do.
Now it’s three years later and SIL is 18 still dating this guy and has become “part of the family” coming to Christmas and other holidays. This year he spent a lot of money trying to buy everyone’s approval(we were told). We live too far away to travel but in the future if they’re still dating or even get married some day, do we accept it?
I’m of the opinion that she’s 18 now and we really can’t shun them, but my husband (her brother) is really bothered by all of this and wants nothing to do with this guy at all… ever.