GLENDALE, Ariz. -- Sergio Santos has done pretty well for himself by now, to put it mildly. He was a millionaire at the age of 18 after signing with the Arizona Diamondbacks, who drafted him in the first round as a shortstop out of Mater Dei High in Santa Ana, California, 13 years ago.The Toronto Blue Jays paid him $4.5 million last season, several years after he made the career switch to relief pitching.But his financial success is dwarfed by that of his older brother, Gabe, who is a founding partner at Homestead Capital, a hedge fund that invests in farmland in the Midwest and California.