I'm glad that you are not making a huge stink of this as it would probably just make you look bad (as long as you feel they are in no danger, which it sounds like violence or sexual abuse was not an issue with this case). Make sure you document everything. I know it's a hassle filling out all these police reports and calling people (like your attorney and social workers), but it will be well worth it in the end. Being their mother already gives you a leg up in the case, and with his responsibility issues it sounds like you're in a very good position.

p.s. Don't worry so much about what farmgirl said. I don't think she was trying to be rude or come across as being unsupportive. It's just her opinion, and I can understand how many people could misinterpret your actions as being too passive. As I said above, from the sound of things, you feel that the father is no danger to your children and that they are completely safe, even if you are unable to reach them. You've informed the law, and are letting them do their job instead of trying to get in the way. Your keeping your eye on the end game and take comfort in knowing these actions will come back to bite him in the butt.