Here are my suggestions. Please remember I am working on the same issues and my perspective may differ from what a vet advises
1. In my case I will ask what W needs. As I don't want her in the house. I don't feel I am being an assistant in this case I am making sure my children have what they need. When the roles are reversed I don't want to go do the packing. Why can't they pack what is necessary.
2. That one is tougher. I say tell him what you feel at the time. If it is uncomfortable for you say so and ask him to respect your wishes.
In laws. They will say these things. Mine do too. However I have found unless I reaching to them they don't bother to talk to me. No matter what they tell you remember that blood is thicker than water. You are water in this case.
No more family time is probably for the best. It is confusing for you. Stressful and sets you back. It does for me too. Second and maybe more important. It is hard on the kids and gives them false hope that everything is ok. It's not their fault this is going on at all, with my first wife. The only time we are together is for child functions. There is never supper or anything as friends because we are not. We are co parents.
The person that you will spend the most time with in your life is yourself, so make yourself as interesting as possible.