I don't know what relationship, Matt Tam Ambler, had with John, but as a young lad in the early 60s, I was taken in by Tam, and raised for a short time by him. Welfare stepped in, and I was removed from the farm.. I returned when issues were resolved.. I left for Alaska in 63. Tam passed away, in 64, if I remember correctly.. He was very kind, and left that very appreciative lad, 10k. Recently started listenining to, Ian Tyson, and his Jerry Ambler song got me to looking into his relationship with Tam.