I hope some intervention somewhere makes things work out differently. It is important to be at that reunion. That's family and family counts! Go without him. If he has a problem with it, tell him to put his big girl panties on and deal - he had his chance. So he has to function apart from you for a couple of days? You've had to function apart from these family members for years at a time!! Those boys will be husbands someday, and have to share their lives with a wife's family... show them how important it is to respect that...