Rearna Hill is a bastard daughter of Gregor Clegane. She is a member of the Base Sons and the wife of Ser Joshua Stone.
Rearna is the daughter of Gregor and a tavern girl in the Westerlands. Her mother came to Gregor, asking him to look after her as she didn't expect to live long. Afterwards, she was raised at Clegane's Keep with many servants to care for her.