Finding the father should be easier for Kevin. Then he can ask him what his adoptive mother's maiden name was. I found a David L. Irish living in zip code 95472 which is Freestone or Sebastopol California. His date of birth is 12 Sept 1933 so this sounds like the right age. There is no listed phone number for him though. I would have a volunteer check the marriage records in San Franscisco for a marriage record unless they were married in Tennessee. There should also be a divorce record for them that MAY tell when they were married which would then give a clue to a date. Freestone and Sebastopol are in Sonoma County which is just north of San Franscisco County. City directory look up may find him also. Suzanne in Texas