While you are right on everything said there’s only three requirements to be pope: having a penis, being baptized in the Catholic Church, and having being ordered a bishop. The last too can be done real quick in a pinch so the only hard pre-requisite is having your junk hanging down there, no need to be a priest even.
Well I’m inferring your dad’s not a young lad anymore, twice a day is quite impressive even more at 6 o’clock! I think they’re a bit in the honeymoon phase, it’ll mellow eventually*.
But to answer your question I have two options: -Tell him to lower the volume or pick some time you’re not home IF it’s your home, as in your dad has come to live with you or you are roommates, or you are too young to live by your own. -But IF it’s his home and you are old enough then get your own flat/room or some good headphones and let them enjoy life.
*Or not, I don’t know your dad or his girlfriend. Wish them the best tho.