This article or section refers to elements from Original Dune.
A Sister is a female sibling. Famous sisters included Alia Atreides, sister to Paul Atreides, Ghanima Atreides, sister to Leto Atreides II, and Wensicia Corrino, sister to Princess Irulan Corrino.
Sister was also a Bene Gesserit rank. Once an acolyte finished her training, she was usually awarded the rank of Sister.