Get counseling for the children. You are in no condition to help them all by yourself. When they ask questions that you can't answer....just tell them you don't know.
Don't try to force anything on them and let them feel whatever it is they are experiencing. Your W is probably trying to force OM on them and wants them to accept him. It's all too much for them.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!