HEIRS OF SALVADOR AND SALVACION LAMIREZ, NAMELY MARTHA, JHONY, AND JAVIER LAMIREZ, REPRESENTED BY DOLORES PARREÑAS; HEIRS OF ALFONSO AND FLORINDA ESCLADA, NAMELY ABELARDO, ALFREDO, HELEN, MARILYN, ELIZABETH, AND ALFONSO, JR., REPRESENTED BY GILDA E. LACANDULA; AND HEIRS OF PROVIDENCIA AND RODRIGO LLUPAR, REPRESENTED BY ETHELDA LLUPAR,[1] PETITIONERS, VS. SPOUSES AHMED AMPATUAN AND CERILA R. AMPATUAN, RESPONDENTS