what is the meaning of half brother or sister
Sibling Half-siblings are people who share one parent but not both. They may share the same mother but different fathers (in which case they are known as uterine siblings or maternal half-brothers/half-sisters), or they may have the same father but different mothers (in which case, they are known as agnate siblings or paternal half-brothers/half-sisters. In law, the term consanguine is used in place of agnate). They share only one parent instead of two as full siblings do and are on average 25% related.[3]
Brothers & Sisters (season 5) Beau Bridges has been cast as Nick Brody; Nora's highschool flame. He has signed on for at least five episodes and will first appear in the middle of the season.[8] It was announced that Ida Holden (Marion Ross), mother of Saul and Nora, would die off-screen, without appearing in any of the last season's episodes.