UNION BANK PHILIPPINES OF THE PHILIPPINES, PETITIONER, VS. SY LIAN TENG, EMERENCIANA SYLIANTENG, ROBERTO SYLIANTENG, LORRAINE SYLIANTENG, CESAR SYLIANTENG, CLARITA TANG, ROBERTO TANG,* MARGARET TANG, PATRICK TANG, FREDERICK TANG, GLORIA LIM, ALBERT TANG, AND HELEN TANG, RESPONDENTS