The Stolpersteine family story

Story of father's family - a Jewish family from Vienna. Father's family: The family surname was Stolpersteine. A number of family members died in the Holocaust. Father's great-grandfather, Paul Weisz, died at Theresienstadt. Father's twin brother and his sister also died in Vienna. Father managed to survive/escape. Found out about these family deaths when he was 18. Mother's family: father was in France and Belgium during war [not clear if this was in a military capacity]. Grandmother left London during the Blitz and married during the war.