Am I being unreasonable?

this post may end up being a little long, but I really want some honest opinions..

So my fiancé didn’t have a great upbringing, his mum passed away when he was 8, leaving him and his 2 sisters with their dad, who although wasn’t a terrible dad, never really wanted kids in the first place, and was never home for them. He worked away, so they’d be left for weeks at a time to fend for themselves.

So fast forward to now, their relationships with his dad is strained, but not too bad. We live 10 mins away from one of his sisters, and his dad lives 2 hours away with his girlfriend.

When his dad and his partner visit for family functions and things they stay with us because his sister refuses to let them stay at her house anymore because they basically drive her nuts. I don’t particularly enjoy having them here for various reasons, but mainly because they make me feel really uncomfortable in my own home. But I suck it up coz at the end of the day, they’re family.

So here’s my dilemma. We have our second child due in August. Obviously they’ll want to come and visit, but I really don’t want them staying with us when the baby is born, and ideally, for the few months following as well.

Am I being unreasonable if I insist they stay somewhere else whenever they visit for a few months?

They do have a few other friends that live in the area, and the partners mother lives about half an hour away so that’s a possibility too, but they’ve just come to expect that whenever they’re down they’ll stay with us.

What do i do??