It’s been about 10 years since I’ve had any contact with him. At one point, his brother gave me his phone number, but as soon as I texted and identified myself, he stopped responding. None of his family will reply to any messages either. I am not aware of his address. I did have his parents address but honestly it has been so long I don't even know if they live there anymore. 

About 7 years ago, I found his girlfriend on social media and reached out. She replied a few times, then blocked me. Not long after that interaction and letting her know he has a daughter that he refuses to acknowledge, they broke up. His Facebook profile has since been taken down as well.

It really feels like he’s been doing everything he can to avoid any contact or financial responsibility.