Firstly I would refer you to my post immediately above yours.
Next I would suggest that you carefully read the page in this link:
.
http://www.dswd.gov.ph/faqs/travel-c...ce-for-minors/
Even if all paperwork is completed correctly and all correct documentation supplied, the immigration can turn back at the airport any Filipino citizen they feel like, especially in the case young women and any minor.
Again, for the sake of an airfare, I recommend that your wife accompanies them, (and preferably sorts out their travel documents over there too) but it's up to you.