((((Hug)))) and I don't care how fucking unmumsnetty it is.
You have 4 small kids, a DH who is very helpful (to ever bugger else, but not where he's needed right now, AT HOME), then when he is home says he 'hates cleaning' and you are moving in 3 weeks 💐
I'd get him told. Properly. Tell him it's fine for him to do something with FIL tomorrow, out of the house & with the children. I don't care how difficult it is with allergies, he can suck it up. While they are out, do something nice for yourself before you lose the plot entirely.
Tell him what he needs to do tomorrow, whether that's xyz in the house or taking the kids out so you can get on.
Until you move, make lists, tell him it's not a request it's the bare minimum required to get shit done before you move.
Once you are in the new place, get this sorted. You didn't sign up to live in a bomb site with a DH not cleaning & not pulling his weight. Tell him how seriously pissed off you are.
💐 Stay away from the chocolate, it's not like carb! X