I will name some more of the notable ones:
Tommie and Hank Aaron (Milwaukee/Atlanta Braves: 1962-65, 68-71). Tommie managed only to hit 13 career home runs, but combining it with big brother's 755, they hold the MLB record of most career home runs for brothers.
Jim and Gaylord Perry(Cleveland Indians: 1974-75). The Perrys are the only brothers to each win a Cy Young award. Jim won the award in 1970 for the Minnesota Twins while Gaylord won the Cy Young twice: 1972 with Cleveland and 1978 with San Diego.
Dizzy and Paul Dean(St. Louis Cardinals: 1934-37). The always confident, Dizzy, predicted for 1934 season: "Me an' Paul are gonna win 45 games". He was right. Paul finished the season with 19 wins and Dizzy with 30.
|1983 Donruss HOF Heroes|
Paul and Lloyd Waner(Pittsburgh Pirates(1927-40. Boston Braves, 1941. Brooklyn Dodgers, 1944). The Waners are the only brothers to each make the Hall of Fame. Paul was nicknamed Big Poison and Lloyd, Little Poison.
Jesus, Felipe and Matty Alou(San Francisco Giants: 1963). All three had long MLB careers but only were teammates for only a brief time in 1963. For three games, the entire Giants outfield consisted of an Alou.
Roberto and Sandy Alomar Jr (San Diego Padres,1988-89. Cleveland Indians,1999-2000. Chicago White Sox,2003-04) . The Alomars are the only brothers to each win an All Star game MVP. Sandy in 1997 and Roberto in 1998.
Here is a complete list of brother teammates: http://www.baseball-almanac.com/family/fam6.shtml