Husband moved into OP's home, where she was living with her son. Their family home. They didnt move in with him. So she's provided the roof over the head.
Some posters speak as if Husband provided everything for them. He didn't.
The grandchild visits are the bare minimum, yet Husband can't even put up with that? He's not into family life, yet he married a Mother. It was always the case that grandchildren visits would very likely be on the cards sooner or later.
You'd think the grandchild was going to be living with he & OP 24/7 the way he's acting up.
What's OP supposed to do, see her grandchild outside the home? Should her son also not have his son around his family home? When Son leaves home what happens then, barely any visits as Husband doesn't want any baby noise around?
I don't know who mentioned getting a council flat but that's naive, and laughable in this day and age to actually think it's easy and will happen soon.
OP, welcome your grandchild into your home, until such time as your son can get his own place. He's in his family home, it's only fair.
If your Husband can't stand a baby being around he'll have to get noise cancelling earphones, won't he? I bet he won't though, he'll make you feel upset and awkward about having your grandchild around.