Am I wrong for not wanting to stay at my fiance's family's house for a long time?

So my fiance, (we're getting married in the summer). Since we've been together he'd go visit his family up north for the summer. Like a month or two. It's mom, step dad and younger siblings. His siblings are older now, one's in college and the other is about to graduate highschool. So he liked spending time with them but they're older and they do their own thing. My fiance complained this summer how he felt bored. So he said I can come with him to visit since we'll be married by the time but the thing is I don't feel we should stay for a month. Maybe two weeks at most but I'd feel I'd overstay my welcome. Instead of spending the summer with his fam we can just go on vacations or do other stuff.

Am I wrong for not wanting to stay at my fiance's family's house for a long time?
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