I am really sorry for you, I am almost in the same case too. My loved one is being
deported to Vietnam, and
I can't imagine of being half way around the world from him.
I asked for help from many lawyer, and the answer is "there's nothing we can do for him". No body's going to listen or gives him a second chance because his conviction of an aggravated felony-sexual abuse of a minor. I just stand here and see they take my boyfriend away, my green card is conditional,
I just cannot even file a petition for him.
However, you have a better position than me. You and your three children are US citizens. Your hardship would be the best way to keep him here. You need an attorney who's really good at
deportation defense. Good luck for you.