There have been over 350 brothers to play in Major League Baseball history, and nearly 100 sets of brothers have played together as teammates. Several players in the Hall of Fame had a brother that also played in MLB, but their performances did not reach the same level of prominence of their (usually older) sibling.
In their 48 seasons, there have been seven sets of brothers who have played for the Oakland Athletics, with only two of those sets being teammates at one time or another. In all cases, it is the older brother that fans will recognize with the younger sibling living in near obscurity in the shadow of his older brother’s accomplishments.