Question: What is the cause of death of Marvin Bush's father?
Sentence (from "Marvin Bush"): Bush is the youngest son of former U.S. President George H. W. Bush and First Lady Barbara Bush and the brother of former U.S. President George W. Bush; former Florida Governor Jeb Bush; Pauline Robinson "Robin" Bush, who died of leukemia at the age of three; Neil Bush; and Dorothy Bush Koch.
Relevant evidence: Yes