I’m looking for my ancestors. Grand-grandfather.

Hi, I’m looking for my ancestors. My biological grand-grandfather was living in USSR, now this territory is Ukraine. He survived WW 2. My biological grand-grandmother died during Holocaust. They saved my grandmother. She was a little child, when her parents give her to another family, that was living in Trembowlya, Ternopilska oblast. She was register as Kateryna Lehka. Mykhaylo Lehky became her new father. Her biological father visited her around 1970. I hope to find some information about him. Hope not so many east european jews have similar story, so I tried to find my ancestors.