My oldest daughters father is in and out of her life, Luckily we never lived with him so I can't say I know exactly how you feel. I do understand having a father who doesn't always think first about his child, and I know how heartbreaking it can be to you. I try my best to surrond her with positive role models because there isn't much you can do about who her father brings into her life. Have you considered court? I recently duked it out in court and later settled for mediation, I set clear boundaries on his time with her (safe enviorment, healthier foods, I always knew who she is around and I have veto power to some of the places he takes her.) You may be able to have the same arrangment. If he's posting things on the internet you may be able to prove to a judge he isn't fit to have her on his own, but it might be a longshot. Talk to a lawyer if you are really concerned, the sooner everything is down on paper the better anyways. Having a lawyer in your corner is better anyways, KKs father wants his 2 weeks of the year in a few months and after finding out the carseat he bought was recalled 8 years ago, I told him he needed to buy another one, he wouldn't budge but after a quick call the lawyer, the judge granted me permission to refuse his visiation until he proved he bought a new carseat. If you go through it try mediation first, you have way more control over everything, if you go to a judge you're leaving every thing up that person who doesn't know your family or your child. I hope this helps, but I know how hard it is. let me know if you need anything.