Question: What is the date of death of Helena Unierzyska's father?
Sentence (from "Helena Unierzyska"): Helena Unierzyska "née" Matejko (6 April 1867 – 11 October 1932), was a Polish painter and sculptor, daughter of Poland's national painter Jan Matejko and his wife Teodora Giebułtowska who often posed for his paintings.
Relevant evidence: Yes