Klára was the daughter of János Thúróczy de Túróczszentmihály but her mother is unknown. The date and place of her birth have not been found.
Her husband was Péter Forgách de Ghymes et Gács. They were married, but the date and place have not been found. Their six known children were László (?-?), György (?-?), Ferenc (?-?), János (?-1465), István (?-?) and Osvát (?-?).