I found out a couple years back that I have an older half sibling in Japan, born mid-late 1955/early 1956. Unfortunately, my father has passed on, and no one else in this half of the family is aware of my sibling's existence. My dad was Jack Clement Miller, born Jan 31, 1933 and was in the Navy, and, I believe stationed in the Tokyo area in 1955. His girlfriend was pregnant when he left, and he never heard back from her ever again, even though he left her all necessary info for anything the baby might need. I might be able to dig up his ship info, but I have little else. I don't even have his girlfriend's name. He did say she was a madam, and that when he left, she'd amassed a fair amount of stock in Sony or similar company, so she wasn't worried about providing for the baby.
My dad (and I) have 0 negative blood, if that helps any. I'd really like to find him or her. I always had the feeling that I wasn't the oldest, and shortly before my dad died, he confirmed it, but swore me to secrecy.