Depending on your arrangement, the transfer of license would pose no problem. If your Dad decides to process the transfer he'll be needing the following ;
a. Absolute Deed of Sale (Notarized)
b. Affidavit of transfer (form available at FED or some gun
store ; Casa Armas , etc.), to be notarized
c. 4-2x2 ; 1-1x1 pictures
d. Accomplished Firearm Application form (4-copies)
e. Previous gun license (original, yellow form or Gun license
Some gunstore will accept the processing by just providing the above documents plus 6T (try Marksman at MCS).It will only take one to two weeks. If your Dad decides to process it for less than 6T , you'll be supplying some more documents (just like applying for a new firearm plus the payment of penalty). For license transfer , the processing etc., would cost you around Php 1,780 (processing , tax , ID card)+ the other requiremnts like Drug test , Neuro, Local clearances etc. and where applicable ,the penalty for expired license.