Giving an Android phone to elderly/non-technical people is asking for trouble imho. They will eventually tap their way into installing suspicious apps, adware or even straight up malware. It's inevitable, they are not aware of what they do and how to avoid the many risks of the digital world. I remember having the same struggles of OP when setting up a cheap android phone for my grandma, the amount of bloat, adware and misleading content I had to remove was incredible (and some couldn't even be removed). The irony was that after a few months of light usage, the phone was in a state even worse, full of downloaded apps and opened suspicious websites in the browser. She would swear she never even noticed any of those.

This is one of the cases in which giving them an iPhone with its walled garden has great benefits. You can also setup parental control on top of that already locked down ecosystem.