Looking for Tomoszek, Thomson

I am looking for information about Tajo, Vanda or Helinka Tomoszek who are related to Yanek Tomoszek(aka John Thomson) who was my adopted father who moved to Edinburgh during the war. Their father was Karol who was my dad's brother. Last I heard was that Tajo was running the family farm in Katowice. John married Margaret Blair in Edinburgh and they adopted me in '67 although I was born in Edinburgh on 9/12/66. I have only recently found out that I was adopted and as both John and Margaret are dead I do not know where to start the search for my real family. My real mother was polish and had me adopted when I was about 6 months old. She then went on to Germany to study music. If anyone can help me or give me advice on how to find my real family I would really appreciate it.