I was divorced from my oldest daughter's father (she's now 24), when she was 1 1/2 years old. When we got divorced I too had to go after him for child support, there were many years I did not receive the support, but I continued to go through the courts until I received it on a regular basis. I told me ex when we got divorced, it was his choice as to how much he wanted to have to do with his daughter as she grew up. IF he wanted to see her, I would never not allow it due to him not paying support or any other reason. Long story short, he chose to not have much to do with her, her entire life. Now, at 24 years old, my daughter doesn't really know him & he has no clue as to who she is. She's comfortable with it. If there was ever a time she wasn't comfortable being around him, I would never force the issue, as you have said your daughter is not comfortable. If he wants to see her, I would suggest he begin talking to her on the phone first, and let her get comfortable talking to him. If she's comfortable with having him to your home (and your comfortable with that), give them space in YOUR home to visit & get to form a relationship. Take the cue's from your daughter & respect her wishes. Your ex should respect her wishes as well. On another note, whether your child has anything to do with the ex & his family or not, speak positively of that side of her family & share things that are part of her heritage. I did this with my daughter, and although she has no real relationship with her father, she is very close to her grandmother (her father's side). I'm proud of my daughter & how well adjusted a person she has become & you should be proud of your daughter telling you she's uncomfortable. Good luck to you & your family :)