I have a question involving inlaws and a brother inlaw and renegging and changing plans?

While I can see how this would be very annoying for you, I agree a bit with mom23 that maybe you could have thought a bit more about this before reacting. Kids should be okay to sleep in a sleeping bag on the floor in a home, and if they aren't, they are a bit spoilt and should learn to live with it (and the cousins might really enjoy the sleepout together). The baby should be right with you, shouldn't she? Yes it is inconvenient and maybe there has been some game-playing going on, and you are really going out of your way to travel there. Maybe you could make another time to visit, or get them to visit you. I don't think it is worth letting this get in the way of family reunion time. It would take effort on your behalf and mean dealing with being outside your comfort zone, but really, this visit would have required that whatever way you look at it. Maybe you need to work on being more flexible and less resistant to changes at short notice. Life is too short to be negative. What if something happens to one of the family and you didn't spend that time together? Would this reason really be worth that? Good luck, hope things work out for you.