You talked about how he put you in this position, don't let him continue to do so. Talk to a lawyer NOW. Don't wait, get one going - take their advice, and do what needs to be done so that when he gets back you've got the upper hand. He isn't going to "tell" you what you'll get. No sir! You and your children have a right to the life you had before the jerk walked out on you. Please don't wait - contact a lawyer before going to your mothers.
~Amanda