I am so sorry Weave
It's hard enough going through a separation but when they stay in the house (even in the basement) I would think that would be even harder. (constant reminder).
I'm sure its hard on the kids too. Even if you aren't saying anything negative kids can sense the tension. I'm sure it makes for a very uncomfortable situation.
I agree with AMN. Make that call. It can't hurt. Just find out if they can offer any advise or help.
My prayers are with you and your family.