http://fireemblem.wikia.com/wiki/Brady

Brady is Maribelle's son from the future, and can potentially be the brother of Lucina or Female Morgan, should Maribelle be wed to either Chrom or the Avatar respectively. His birthday falls on February 22. According to his in-game profile, Brady is said to be, in spite of looking intimidating, more likely to burst into tears than bust out a weapon, alongside being the most likely to incur friendly fire.

In Brady's early years, Maribelle had trained in the fine arts characteristic of nobility, much to his immense dislike and chagrin. Still, despite his strong dislike for the matter, Maribelle insisted in Brady's training and he became skilled in noble pursuits such as proper etiquette, horseback riding, and violin playing. Brady has shown a great interest in playing the violin in particular but unfortunately it was a stray snapped violin string that gave Brady his scar over his left eye. Unfortunately for Maribelle, despite her best attempts to fix Brady's rough and thuggish enunciation, Brady could not shake his habit and eventually Maribelle gave up. Like all of the other children, Brady lost Maribelle and his father when they helped to fight off the Risen with the other parents. Maribelle's wedding ring was recovered and given to Brady, which he always wears. When Lucina decided to return to the past to stop the ruinous future, Brady accompanied her but the time stream separated Brady and the other children.