How would you go about discussing this ?

So my fiancé’s mother has started back asking about sleepovers. I’m not comfortable with the sleeping arrangement she wants to do. His parents are downsizing into a tiny house. So she wants to put our son in the loft where her office will be. If you know what a loft is it’s a huge space that has stairs going up to the area. I had the conversation with my fiancé first to see what he thought about it and he even agrees with me that it’s a bad idea.

Whenever we bring something up to her she dismisses it by saying “it’s fine.” “Stop being like that.”

Our son gets into things so her having him sleep where there will be many things for him to get in or possibly hurt himself is what my concern is.

My other concern is I’m not comfortable with any of my children bedsharing with other people. We have been trying very hard to get our son to sleep in his own bed. I’m not worried because I think he’ll be molested, but she has her three cats sleeping in her bed and sometimes her small dog.

Edit:

He doesn’t and I do say no. I hate hearing her trying to get us to change our minds. Then she makes it all like it’s attack on her when it’s not. This is the same guideline for everyone including my own family. It’s bad enough I have to bump heads with my own mom about it.

My son is staying with her (my mother)and I’ve told her he needs his own bed. She said no so yeah I’m already dealing with one person refusing, but I have no one else to watch him as I’m about to give birth in august.