I'm probably wrong but I'm guessing that Paul's father is the man that just got arrested for raping Velcoro's wife. When they first showed him, the first thing I thought was that he looked like he could be his dad. I'm thinking it'll be a reveal like his mother tells him that she found his father, saw his picture on TV after getting arrested. Just something for the viewers to wonder about, similar to how a lot of people were wondering about Woody's daughters involvement last season.
Good episode this week too.