MEXICO CITY All five were found bludgeoned to death, including a teen-agerand two children, 9 and 8 years old.Police investigating an abandoned red Mustang forced their way into thehome of the crusading journalist who owned it and found him, his wife andtheir three children beaten to death in their beds.The bodies of Fernando Balderas, his wife, Yolanda Figueroa, his daughter,Patricia, 18, and sons Paul, 9, and Fernando, 8, were found Thursday nightin their home in a fashionable section of Mexico City.They were all bludgeoned, possibly with the base of a heavy statue, andappeared to have been dead for at least 24 hours, police said.Investigators hoped their questions about the murders would be answeredby a single survivor, Alejandro Perez de la Rosa, 32, who apparently workedfor the family. He was hospitalized Friday and under heavy police guard.On Friday, newspapers in Mexico City reported that the couple not only specializedin exposing government and drug corruption but also that Balderas mighthave been playing both sides of the fence.Drug traffickers commonly bribe politicians, journalists or anyone elsewho can help their business. Mexican politicians also historically haveoffered money to journalists to write pro-government articles or to refrainfrom writing about matters that could hurt officials.Execution-style murders are common among Mexico's drug traffickers, whotransport most of the narcotics entering the United States, including 70percent of the cocaine. But the killing of children is not.Balderas published a magazine, Cuarto Poder ("Fourth Estate"),which specialized in exposing corruption in Mexico.Two newspapers, Reforma and La Jornada, citing unidentified law enforcementsources, said Balderas was under investigation for drug trafficking tieshimself and reportedly had two arrest warrants pending against him for extortionand rape.