Quoting Chroma Hex [+1]:" If I broke up with someone when my child was two, and they weren't the father of the child, and we weren't ... [snip!] ... adopt the child, I wouldn't really see the point in continuing to let them be the father of my child. But that's just me. "
Well thats up to the people involved, but I'm a firm believer that blood doesn't make a parent. I don't know how long exactly he was in her life, but if they have a kid together that is only a year younger than her, then i would say that at 2 years old he had been acting as her father for almost her entire life (1 year and 9 months, at least). When he continued to father his own daughter, he still fathered her as well. I just don't think he would have to be her biological dad for him to have formed that kind of bond with her, strong enough to keep being "daddy" to her. In that case, it's messed up for him to take out a a fight with the mom on her.