If it wrong to say he can’t have people over?

So my husbands dads landlord is putting his house up for sale. Which means he needs somewhere to stay. His dad does not make a lot of money at all and he got lucky with that place because he was friends with the landlord and he gave him a extremely low rent. So he is having trouble finding another place for rent that he can afford.

So he is going to stay in our RV temporarily that is parked on our property.(oh god I hope it’s temporarily 🤞) I like his dad but his dad dates the worse trashiest women. They are always drug addicts, or alcoholic with no jobs use just use him for a place to stay and money. The last one was a 21 year old drug addict (his dad is in his 50s and we are 25) so she was younger then his kids 🤮. We really don’t want him to have anyone over in our RV. I’m a germaphobe and the thought of him having sex on our BRAND NEW RV we just bought completely disgusts me. So I wanted my husband to tell him he can’t have any guest over just he is allowed over and if he wants to hang out with someone he has to do it somewhere else. My husband doesn’t want him to have anyone over either but feels like it’s rude to tell his dad that.

Also we are not charging him rent we are letting him stay for free in the hopes he will save up fast to find somewhere else to go.

Do you think it’s wrong to tell him he can’t have anyone over?