Am I crazy?

My husbands family (his sister, her husband and their 2 kids under age 4) come to visit from out of state and always stay with us. I’m an introvert and this is extremely hard for me, not just because it’s them but because I need a lot of alone time- I’m in school and work from home. We bought a house last year and they have come to stay 5 times within the last year, for about a week at a time.. sometimes more. They also stay through Christmas.

I love his family but this is too much for me and we have gotten into so many fights over it. He thinks “family is family” and wants to give them a place to stay whenever they need it, but they are not in a financially difficult place at all, and he’s also out at work each day while I work from home while they’re here.

Am I insane? I’d love to hear how other people might handle this, or any advice, please 😞🙏🏻