So we setup his software wallet and he bought 0.01 BTC. Not sure if he'll buy more, but I can certainly say I'm proud of him!
What is the software wallet you used to set up for your Dad?
Hopefully it is an open source self custody wallet.
Setting up that wallet for your Dad is not enough. You should teach him how to backup the wallet seed as well as how to recover it from seed. You should teach him that he should not give up that seed information to anyone. Because if he leaks it to others, he will lose that wallet and bitcoin will be stolen by people who know that wallet seed.
Security checklistSecuring your Bitcoin walletDid you manage to convince your dads or other older people in your family to buy BTC?
I didn't do this and won't do it.