If you want your dad to be full-stack dev :) Maybe push him towards learning backend development ( like python as you mentioned ) and use some MADPs ( Mobile Apps Development Platforms ), like https://www.kinetise.com. Which basically allows you drag and drop mobile application and connect it to your backend. It will give him more fun to create mobile apps as well.
Codecademy seems fine, I've also found https://codecombat.com/play :) maybe it's more fun :)
If you want your dad to be full-stack dev :) Maybe push him towards learning backend development ( like python as you mentioned ) and use some MADPs ( Mobile Apps Development Platforms ), like https://www.kinetise.com. Which basically allows you drag and drop mobile application and connect it to your backend. It will give him more fun to create mobile apps as well.