Get an older paperwhite 3, jailbreak it with a serial cable, purchase the remote in the KindleLazy thread, install KindleLazy and your Dad will be good to go. It's currently the ONLY way I know of to get remote page turn for an ereader. It's so pathetic to write that in 2019, but, that's the current state of things.
https://www.amazon.com/Certified-Ref.../dp/B00QJEL42Y
Also you can score a paperwhite scratch and dent for 50 bucks. Perfect for hacking away at.
https://computers.woot.com/offers/ki...lnd_cat_pc_5_2