KYHillChick got me to do the Ancestry.com spit test.
So far, I've gotten email from two possible previously unknown cousins. Both were illegitimate issue of my Dad's relatives. One by an older brother and another was by one of his first cousins.
The good news is that Dad may have given me a tall story regarding what he did during the Korean Conflict. The part about him being the real-life Sparky (from M.A.S.H.) is undoubtedly correct. However, he may have overblown his "patriotic duty." According to Dad, he and a buddy were in charge of delivering nurses out to the M.A.S.H. units from Kimpo. They'd show up at the plane in an ambulance. The buddy drove while Dad entertained the nurses with Screwdrivers made from frozen OJ concentrate and 100 proof medicinal alcohol.
"I did my patriotic duty. Every nurse we delivered arrived drunk and pregnant," declared Dad.
So far, no half-siblings have shown up.
