SAN FRANCISCO -- A suspected gang member accused of killing a father and two sons escaped prosecution in a weapons case earlier this year when the San Francisco district attorney's office concluded it didn't have enough evidence to connect him to a gun that a passenger in his car was carrying, authorities said Thursday. Edwin Ramos, 21, of El Sobrante, who police say is a member of the Mara Salvatrucha (MS-13) street gang, was formally charged late Thursday with three counts of murder in the shooting deaths Sunday of Tony Bologna, 48, and his sons Michael, 20, and Matthew, 16....