The Kennedy stamps along with the Mexico Olympic issues popularly called the "Mosden Stamps" were never issued as postage stamps in the Philippines. But it is interesting to note that a lot of these stamps went to the hands of stamp collectors worldwide.
The Philippine Postal Administration never granted recognition to the Mosden stamps as bonafide postal papers. They claimed that the stamps were printed without the approval of the postal administration, no official personnel was present to check and oversee the printing of the stamps, and the quantity of the stamps printed was not known to the postal administration.
Click here to see the Kennedy family tree.