You can always turn her welfare over to the professionals, and sit back and watch the situation resolve itself without any meddling on your part...

He's not doing what you want and that is putting you into a bind...That's the controlling/codependent part of your personality coming through.

The professionals are actually pretty good at what they do too. Besides getting the kids teeth fixed, they'll work on reunification of the family by helping the dad get his act together....That is something that you are not equipped to handle.