Philhealth eligibility for Expat of Filipina spouse

Hi, does anyone have the facts if an Expat can be added to his Filipina spouse Philhealth coverage and exactly what the requirements are and cost? There is so much misinformation all over the internet on this subject. Even at their offices you get different answers. Thanks in advance.

I have philhealth covers me my wife and son cost p4,0250 a quarter