They were three brothers that all escaped poverty in the Dominican Republic, and were each signed by the San Francisco Giants. The Alou brothers were the first set of three siblings to play in the outfield together on September 15, 1963. They were also the first set of three siblings to bat in the same half inning only 5 days earlier. They never started a game together in the outfield.
Jesus Rojas Alou at the time of his signing the Giants considered him the best prospect of the three brothers. The Giants signed him for $4,000. July 10, 1964 was the best game of his career going 6 for 6 with a home run and five singles. He never developed the power the Giants expected. He had a career high of 9 home runs in 1965. 1970 with the Houston Astros was his best offensive season slashing .306/.335/.384, but with only one home run his was traded to the Oakland Athletics. In Oakland, he would be part of the 1973-1974 Oakland A's World Series Champions. Always a solid outfielder, he had a long career with 15 seasons in the Major Leagues.
Mateo "Matty" Rojas Alou made his Major League debut for the Giants on September 26, 1960. His career was wasting away in San Francisco as platoon player. He was traded to the Pittsburgh Pirates, and under the instruction of Harry "The Hat" Walker his career was revived. In his first season with the Pirates in 1966, he won the National League batting title hitting .342/.373/.421. It was the start of a four-year stretch where he hit .330 or above. He was a National League all-star in 1968-1969. He was also a member of the 1972 Oakland A's World Series Champions. He closed out his career with the Cardinals, Yankees, Padres, and a three-year stint in Nippon Professional Baseball.
Felipe Rojas Alou signed with the Giants in 1955 for$200. When he made his debut in 1958, it would be the start of a 17-year career in Major League Baseball. It wasn't until 1961 that he started to get enough playing time for his power to blossom. He hit 18 home runs that season, he would hit 25 and 20 respectively before being traded to the Milwaukee Braves. In 1966, he enjoyed the best season of his career hitting 31 home runs with 74 RBI. He topped the National League in runs scored (122), hits (218), and had the best slash line of his career .327/.361/.533/.894. 1968, he again led the NL in hits with 210 hits, but at 33 his power was tapering off at a rapid rate. He would bounce between the Oakland A's, New York Yankees, Montreal Expos, and Milwaukee Brewers to close out his career. He was 3-times all-star (62, 66, and 68). He served as manager of the Montreal Expos from 1992-2001, and was National League Manager of the Year in 1994. He also managed the San Francisco Giants from 2003-2006. In 2015 he was elected to the Canadian Baseball Hall of Fame, and 2016, Alou was elected to the Caribbean Baseball Hall of Fame.