HEIRS OF GILBERTO ROLDAN, NAMELY: ADELINA ROLDAN, ROLANDO ROLDAN, GILBERTO ROLDAN, JR., MARIO ROLDAN, DANNY ROLDAN, LEONARDO ROLDAN, ELSA ROLDAN, ERLINDA ROLDAN-CARAOS, THELMA ROLDAN-MASINSIN, GILDA ROLDAN-DAWAL AND RHODORA ROLDAN-ICAMINA, PETITIONERS, VS. HEIRS OF SILVELA ROLDAN, NAMELY: ANTONIO R. DE GUZMAN, AUGUSTO R. DE GUZMAN, ALICIA R. VALDORIA-PINEDA, AND SALLY R. VALDORIA, AND HEIRS OF LEOPOLDO MAGTULIS, NAMELY: CYNTHIA YORAC-MAGTULIS, LEA JOYCE MAGTULIS-MALABORBOR, DHANCY MAGTULIS, FRANCES DIANE MAGTULIS, AND JULIERTO MAGTULIS-PLACER, RESPONDENTS