My suggestions from being there - sharing the kids - etc.

- Do not move out. Even for a day. Stay with the house and the kids.
- Do not agree with the 3/4 day thing. If she wants to spend time with the kids for a day or whatever, let her figure out when/where/how to take them.
- If she wants to spend time with the kids at the house, then you be there, maybe not in the same room, but be there.
- If she wants to D, let her do all the work. Tell her you want her to be happy, no matter what, and you don't agree with the decision to D. (Stop there, no if's, no and's, no but's)
- Do not bring up the OM again. Be very direct and firm, but not angry, about you staying in the house with the children.

God be with you.