Jason Hagerty, 2011 Bowman; Jason has played in the Padres organization since 2009 and is currently playing at AA San Antonio.
Scott Hairston, 2008 Topps; Scott played in 303 games for the Padres from 2007 to 2009. Unfortunately I don't have a signed card of his brother Jerry from his time with the Padres.
Hall of Famers-3
Sets of Brothers-4
Didn't play for the Padres-56