My Father was Derwood Clark. He once showed me a picture taken in 1977 of his ex-girlfriend and her daughter. I'm guessing her daughter was about my age. Somewhere between 16 and 20 years old. This girl looked very much like me. At the time I blew it off. I am now 47 and have looked at the photo again. I'm pretty positive, this girl is my half sister. I know they were in Des Moine, Iowa. The girls name is Barbara, I'm sure her parents are no longer alive, like mine. I'm thinking my Dad and her mom must have gotten together about the same time I was conceived. Probably the late 50's or early 60's. My dad had told me he had spent the night with this woman the night before he married my mom. This was 1945. I think they must have met up somewhere over the years. He never said this was his daughter, he figured I had no interest in knowing. At this time I have no last names. The girl's aunt's name was Eileen. Anyone have any idea who thi is, or how I might find Barbara?