Do I keep her father in her life?

This is definately a hard situation to be in. I was in it myself at one point. The real question you need to ask yourself is "Will he be a good father." It doesn't matter about the other girls. I know it sucks, but as long as you bring up your daughter correctly, this should not effect her. The fact that you and him have problems should have nothing to do with your decision because that is not fair to him. However, if you feel he will smoke weed around your child, or have with the women when he is supposed to be spending time with your child, then he should have supervised visits only. If you feel he is a threat to your child physically or emotionally or you feel like he will be in and out of the child's life, then you don't need him around at all. Hope this helps