<human>: This is really bothering me because it isn't what I think is normal and I think there is more to it, especially from the mother in law. If the kids were still 4 and 8. I could see the 'it is good for the kids to see we can get along' explanation. 

He still does some holidays and other get togethers with kids, ex wife, ex mother in law for birthdays (not just the kids, all of them). Today wasn't a birthday or anything special. Just lunch at the ex mother in law's house. 

He says there is no ulterior motive but then why go along with it?

Can you summarize the given text in a few sentences?
<bot>: I don't like these get togethers with the kids, ex wife and ex mother in law. Do I learn to accept it or end it?