House Brax is one of the chief bannerhouses of the Lannisters. Lord Andros Brax once came to Riverrun to attempt to marry one of his sons to Catelyn or Lysa Tully. His heir is Ser Tytos, and he has two younger sons, Ser Robert and Ser Flement. He also has a brother, Ser Rupert Brax.
Ser Flement is wed to Lady Morya, a daughter of Lord Walder Frey, who has given him three sons. One of them, named Robert, is fostered at Casterly Rock as a page.