Trying to figure that relationship out is hurting my head, but I do get a clear image of two men walking down the street by the old jail near Town Theater of our hometown. In fact, it was not all that unusual for someone to yell out from the barred windows of a cell! Scared me sometimes.
The “obvious” answer would probably be that the inmate is a half brother or something like that....so THAT thought is totally wrong! I think the answer will be found by asking “who is technically the father’s son?”