Grandparents I'm 22

[NLEW1997]

Hello everyone,
Me and my fiancé have recently moved into our new home and had our 1st beautiful daughter in march. She was born prematurely and required extra support for the first month. Everything was perfect when we got home with our DD untill his parents started making us uncomfortable. It wasn't bad at first they were just making snide comments on how we raised her and shouldn't listen to our health visitor. We left our DD for about 2 hours with them and I later found out MIL had co slept with my daughter. We of course wasn't impressed and told her off only for them to say we're being overprotective and stupid. We started to never leave them alone with her because of this and they were starting to make jokes of social services about us apparently not feeding her enough or being too rough (this isn't true). They would get mad if my daughter sat next to me during dinner and not them. They refused her daddy to hold her as they said we have her all the time. His dad calls us selfish for wanting to spend the day as our little family and not with them.. And recently his mum came over and was holding my daughter and then she randomly said that if anyone stopped her from seeing DD then she would kill them.
Im going to talk to my health visitor on what we can do as I think we may have to stop them from seeing DD because their getting quite unstable mentally.
Can I have anyone's opinions whether I'm making the right choice?

Do you live with them ?

The comment from his Mum at the end clearly wasn't literal - is differentiating between literal and a wild over exaggeration something you have difficulty with ? Clearly she was just saying how much she loves him - perhaps clumsily so, but the HV will look at you like

Their behaviour is pretty bad - the snide comments, jealousy etc.
Yes I’d speak to your health visitor, you might as well see if she has good advice about boundaries with them especially if they have different ideas about how to parent to what you do.
If you’re living with them, can you move out?

That is unacceptable, did she always act like this?

Thanks for responding, we don't love with them. We have tried to give them some boundaries but they haven't listened. And it wasn't literal but it was a threat because they keep thinking were prevent them from seeing DD. Even though we see them every week.

@NorthEndGal, no it's becoming worse over the weeks. She has mental health which is making her quite unstable. Shes made some quite nasty comments before

If MIL watched her for 2 hours, she hardly 'co-slept' right? She likely laid down with her whilst baby napped. Why would you tell her off for that?
Saying they are 'getting' mentally unstable is also a red flag to me. Not in relation to them btw, but you.
Please do talk to your hv.