I have to agree with IceCream Kid that even with counseling and medication, that is no CURE, and you'd be setting yourself up for a lot of pain and heartache, and it would be doubly hard on the children! These episodes won't just stop because he gets treatment -- they may subside some, but they won't stop.
Please don't put your children and yourself thru this. It just isn't fair! Your kids have already been thru enough pain by losing ONE father -- dont' make them lose another. And if they don't have any contact with their biological father, please fix it so that they DO, unless he's a danger to them. They have a right to know who he is, and HE has a right to know his own children. Do whatever needs to be done to get them together.
I wish you all the best. I know this isn't what you wanted to hear, but in the end, it's the best for all concerned. God bless and please take care. Hugs, Lee