Barry Allen (also known as The Flash) is an eighteen year-old forensic scientist. His mother, Nora Allen, was killed when he was eleven, and his father, Henry Allen, was blamed for it and is sitting in Iron Heights right now with a life sentence. Barry has been trying his whole life to prove his father's innocence.
Barry grew up with both his parents for eleven years, before his mother was murdered and his father sentenced in prison. When this happened, Joe West took him in and he has been living with him ever since.
More info on Barry Allen will come with the release of The Flash 1x1.