Simplify the following text for a Grade 6 native English-speaking person.
Original: Her other four siblings are Jeb Bush , Neil Bush , Marvin Bush , and Robin Bush , who died of leukemia in 1953 .
Simplified: Her siblings are George W. Bush , who is the 43rd President , Jeb Bush , Neil Bush , Marvin Bush , and the late Robin Bush , who died of leukemia in 1953 .