Houston Male Adopted 1975-1976 You have a Sister

My parents are Maria and John Williamson who lived in Spring. Baby Hans Williamson was born in Portland OR at Emmanuel Hospital in 1975 prior to the move to Texas. I had hospital record of the birth but have never located a death or adoption record of my brother. He went MIA 6-9 months old. Perhaps left at a Houston adoption agency without fathers consent. My father came home from a work trip to find his son gone, he’s always hoped he’d find my dad in Portland. If this could be you please reach out.