Hello, im basically in the same boat. I have very limited info on my half brother. Our father passed away 30 years ago. He wasnt married to my brothers mother at the time. I only know his mothers first name and his first name. Also im not even sure if my father and his mother were ever married. I do know that he was adopted to his mothers new husband. Again no info on the new guy. Also im from the US. I believe this all happened in Iowa. My father was married two times that I know of for sure. I know most important info on my father except for this area of my half brother. He would be older then me by at least 5 years if not more. Any ideas would be greatly appreciated, thank you!