Kopp

Looking for information on Kopp family, current or anc.
Erwin Augustin Kopp born July 25, 1919 in Sternberk. Birthplace may or may not be correct – I don’t have a certificate. His brother Ernst & sister Margarete were part of the Sudeten rescue in 1939, settled in St. Walburg, Saskatchewan.
Father remained in Czechoslovakia, remarried and passed around 1978. He may have had more children.
Erwin & his wife Helge (Mildner – also part of Sudeten rescue) were killed by a drunk driver in Sept 1982.
Any guidance or help would be appreciated.