Hello, I'm tracing my great grandad Piotr Teresko's side of the family. I know he resided in Mlawa, Poland at some point between his birth in 1925 and his marriage in England in 1949. I'm unsure if he was born there or not. I know his father was Platon Teresko and he died before 1949, again I'm not sure if he was born in Mlawa or even Poland for that matter. I've heard the surname is a number of things from Russian to German (One of the two seem more likely as it doesn't strike me as a polish surname). Is there anyway I could expand my research on Piotr and his family?