Who is this man?

Diana started taking video's of just about every interaction with dad in the past year.  Some of them I haven't even seen.  I'm glad that she does it, but I'm not ready to watch all of them yet.  The time will come...

In the video shared below, Dad and I had just come back from a ride to the store where we talked about jazz, things we did when we were kids, and how important family is.  I could tell that he thought I was a friend of his instead of his son, but we had a good time anyway.  This was Father's Day 2017.  When we got back to the house he told mom how he was having a good time hanging out with his "buddy".  She pointed to me and asked him...  Who is this man?