My future SIL and her husband were invited to our Bachelor/Bachelorette party in Vegas for a weekend. My FI's parents said they would watch the little ones while we are gone at home, which would be awesome. A couple of days ago, my FI overheard them saying that they could watch the kids in Vegas if SIL and husband wanted to bring them with. I feel it's inappropriate to bring a toddler and a 4 year old to a Vegas, adults only trip. Either way, I wouldn't say anything to them, I just wanted opinions and if I'm justified in thinking this would be a little strange....