We have 5 children. We have 3 bedrooms, one of which serves as a guestroom when needed. MIL lives a short plane trip away, and when she flies out to visit, she stays in our guestroom.
SIL lives a 2-hour drive from us. She has 1 child. MIL quite often flies to our place and then catches a bus to continue her visit with SIL. MIL doesn't mind doing this.
However, SIL has now decided that whenever MIL comes to visit us, they (SIL, FIL, and DC) will come and visit us, too. This means they bunk down in our living room for the duration of their stay.
I do not like hosting SIL at the best of times as she takes over the entire house and we feel squeezed out of our own space. I especially dislike hosting her and her family when we are already hosting other guests, even if that guest is her mother. It feels like we're the ones putting on Christmas every time IYKWIM?
SIL hosting us when MIL visits her is not an option as there are 7 of us and they would have to put us in their living room, and they don't feel that would work.
Is it wrong of me not to welcome SIL to stay with us every time her mother visits us? This whole situation causes me a lot of stress, makes me feel like a prisoner in my own house, and I have no perspective on it anymore. I'd appreciate some objective input, thanks.