Your dad has great taste, and honoring him by drinking these gems will be a fantastic honor.
The Glenfarclas 25 sells in the New York for $150-175, the 30 (though not currently available) in the $250-300 range. The G&M bottling probably in the $200 range. I can probably find out whose spirit is in this bottling if you're so inclined? But all you really need to know is that G&M is first class from cask to mouth.
If you decide to keep them for another day, as my wife is a Filipina, I'll be happy to share them with you when we visit next