He was the son of Polish high school professor , Roman Vetulani , and Elżbieta Kunachowicz , brother of Kazimierz , Tadeusz , Zygmunt , Maria , and Elżbieta .
Head entity: roman vetulani Q7362236 10 11
Tail entity: kazimierz Q6381245 19
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40