Dbacks homers from 3 guys with big league bros

Just saw the Arizona partial boxscore for a game in progress, and couldn't believe my eyes. Stephen Drew, Adam LaRoche and Justin Upton have all hit homers through 6 innings in that game. So what, you say? So, J.D. Drew, Andy LaRoche and B.J Upton are all proud brothers. And all three are ALSO active players on major league rosters. Don't know if this is a first, but it seems mighty uncommon--three all on one team, homering in the same game, all of them with big league brothers, too.