My brother's replies:
Your brother is in Phil after a long stay..How long? 2003 = 9 years
His Filipino passport expired..While he was in Phils? yup
What passport did he use to enter the Phils.... i used Filipino passport upon entry it was stamped
Is he a dual citizen? no not sure, i dont have the papers alien certificate
Did he show both passports on entry? i showed both but only the filipino got stamped