Genealogy / Want to find a person [762]

[Moved from]: Missing relatives from WW2 - K.J.J. Jeczalik born in Lviv, married to Zofia Śmigiel

Hello there, I have been trying to trace my late grandfather's wife and children.
He was Kazimierz Josef Jan Jeczalik born in Lviv in 1908. He married a Zofia Śmigiel and had two children Ryzard and Adele born in the 1930's.

Has anyone any idea how to find out what became of them, as I would love to know if they made it through the war.

I acquired his military records which asked him the question of where his family are now... his written answer just says "Russia? "