I feel so sorry for this poor little thread sinking down the list so I'll revive it to say nothing actually useful. I haven't seen Jack & Margaret King since the mid 1960s and they seemed quite old to me then. What I suggest is that youbecome a Mudcat member and PM Kevin Sheils who has a memory like an elephant and knows the name, address and phone number of everybody in the known universe, and thus might have some idea of what happened to them.