[horseofcourse]

I would simply spend as much time with your sons as you possibly can. Offer to babysit whenever possible when you aren't working and she takes off for the night. I don't know what your situation is personally or financially, but GBBob is right this sounds like a situation that may be beyond this board. I just think you should see your sons as often as you possibly can which you may already be doing. And if she is keeping you from doing that, then you have other issues that go into the legal and therapist realm.