Thank you very much for the information and links. We are combing through the address/phone books, trying to determine which "Alfred Dallmann" "disappeared" when. Hopefully, that will narrow down. I know 1/2 the family ended up in East Berlin, as my husband remembers going through the checkpoints in 1972 on a visit with Oma, not to mention the train from West Germany to Berlin. What records could I look for prior to 1989 for East Berlin?