Thank you Thornton, My anxiety is pretty high right now but it's coming down.
I thoughts were 1. showing proof that she wouldn't be moving 3 kids into an apartment. D4 prefers to be me and S14/S12 prefer to be with their dad- would this help keep D4 and I in the house?
2. if she claims abuse or domestic violence to be able to protect myself by proving she is the assaulter and instigator of any hostility.
You really need to speak with an attorney to clarify your concerns. We can give you advice based on personal experience but the laws vary so much that you need to get an expert who is fluent with your situation and location. You're likely going to end up splitting custody 50/50 on your D4, at least initially, but what you want to avoid is letting WW have 100%, which is what she will get if she can get an abuse charge on your record. Be very careful - I would try to stay out of the house as much as possible while she's there, or at least lock yourself in a room. Your W is your enemy right now and seems willing to go to any lengths to get her way.
Me 47 W 42 T 24 yrs M 18 yrs W living with OM BD1: 3/7/2015 (A with OM#1) BD2: 4/11/2015 (A with OM#2, W moves out) WW filed for D, papers received 9/18/2015. Meeting to determine child custody 9/29/2015.