Dexter Morgan

Both the television show and the first novel gradually reveal Dexter's complete back story. Dexter was born out of wedlock in 1971 to a young woman named Laura (Laura Moser on the show), although a later episode says he graduated high school in 1991. In the novels, Laura was involved in the drug trade. On the show, Laura was a police informant for Harry Morgan and his secret mistress. Dexter's father (named Joseph Driscoll on the show) was in the US Army and served in the Vietnam War, but later became a drug-addicted criminal. Dexter also had an older brother, named Brian. On October 1, 1973, Dexter and Brian witnessed their mother's brutal murder at the hands of three drug dealers. For two days, the brothers were left in a crate, surrounded by dismembered body parts and sitting in a pool of blood. Harry adopted the three-year-old Dexter, while Brian was left to the child welfare system.

Question: do dexter and brian have the same father
Answer: yes