I understand you feelings of guilt. Do you see the manipulation from W, the using of the children.
Let go the guilt. It is just a feeling - let it flit - do not reenforce it.
Remain intellectual regarding this part, for atleast 11 more days. You know you need this court hearing. This is a business deal that went sideways. Keep emotions at bay - it is that important. Protect you and your kids.
Your kids need reassurance, and you are the best one to do that, perhaps the only one. Ensure they know they are not the cause for any of this. Kids are so focused on themselves, they feel everything in their lives is because of them.
job is right on spot - Keep the focus on you and your children. That is all that matters right now.
DnJ
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.