A couple of quick suggestions for good spirits for Fathers Day.

If he likes tequila especially for margaritas,palms and such  I highly recommend Avion Blanco  a fairly new tequila on the market so he probably doesn’t have a bottle yet. Another great one is Siembra Azul but it is proving to be much harder to find these days.
For Pisco hands down I recommend Macchu Pisco  an all natural, organic and more importantly ( to me ) a lovely tasting pisco (yes, they do exist)
For rum, I would say the Diplomatico Reserva or Zafra among others such as the Ron Cartavio series.
For bourbons try anything from Buffalo Trace, but the Elmer T.Lee is a standout for the value among their portfolio. There are of course a number of new white dog whiskeys that are quite good also, and you can’t go wrong getting him a bottle of rye either. And don’t forget the craft distillery varieties out there too- Finger Lakes Distilling makes some great bourbons and ryes if you can find them.
As to gins- Aviation is a great one, along with Ransoms Old Tom and Citadelle  Gin – especially the Reserve.
In cognac, we recommend Louis Royer ( a very nice if very overlooked brand – especially their single growth bottlings), Pierre Ferrand – all very nice and outstanding for the money, and Delamain as our favorite picks.

As a side note, we are now using Bagcheck to write up lists of our favorite things (by category)and will be using it to do lists of spirits among many other things.