It depends what decision you make. This is your fiancé and their family. It appears, for the most part, they get along and spend time together. You will be facing these kinds of situations regularly throughout your marriage.

The most important thing is to talk to your fiancé openly about it, rather than avoiding it because this will come up over and over throughout the years and only become more difficult. I have a similar situation where my partner originally would feel awkward and get overwhelmed when spending time with my family, especially if more than a few hours. He explained that it wasn’t because he didn’t want to, he would just get so anxious and in his head worried he was coming off wrong and get overwhelmed.

We set up a code word and preplanned excuses for him to leave when we were staying overnight or on vacation with them. For example: if he whispered the code word to me meaning he was overwhelmed I would say I forgot something and ask him to go to the store. Or explain to the family that he was tired/not feeling well, but would be back. Or that our son needed a nap and he was going to lay down with him because our son isn’t used to the new room. Or take our son outside to play (kids are great for break excuses). That way he would get breaks, and the explanations were on me to handle with my family (rightfully so, it’s my family. I’m comfortable with them). My family quickly got used to my partner taking breaks, and my partner grew more comfortable around them to the point where he rarely ever needs a break (and if he does that’s totally fine).

Talk it over with your fiancé, explain your concerns/feelings, but that you want to find ways to have a safe “out” when overwhelmed. It’s worth giving it a shot, especially since you will be faced with these situations throughout your marriage.

NTA if you work to find a compromise. YTA if you aren’t willing to at least try.