I would have to agree with everyone who said dont go. I can understand where hes coming from that he thinks everyone can just get a long, because he only sees the good side of everyone.

After those kinds of comments I wouldn't feel welcome either, especially if there was no apology and he just assumes time has dealt with the issue. You already know your not going to have a good time, you should not have to go. The kids may be a little disappointed at first but will likely forget about it as soon as they arrive.