your welcome!!
its a legal document,meaning it should be notarized,...any law office in the Philippines has a standard form for this and the ''contents may vary'' depends on the situation and what the client wants to be inside it, what is important is the father's signature and notarized meaning its legal...your fiance can hold this document to prove not just the immigration but any other establishment requiring this (ie..schools outside Philippines etc..) or for any future legalities.
goodluck!!