If you love your parents (as you ought), you will want to do what is in their best interest. What is in their best interest depends on the situation! You're in a better position to know that that is than anyone on a forum.
Walmart has some for $20. I had a cheap Bell helmet from WM for use with my regular bike, but with the increase in speed from the ebike I spent the money for a tested, highly rated helmet. Still, it was only about $50 IIRC.
My conventional bikes gather dust, although I did ride one of them one time last spring, and it reminded me why I no longer ride conventional bikes!
About 3 years ago a renter next door moved out and left a Peugeot on the curb. They're sort of rare and I saw them selling for as much as $150...
Cloud 9 seats are wider. But AFAIK any replacement seat's rearward adjustment will be limited to the length of its mounting rails, which is maybe an inch.
My first thought was the Lectric XP Lite, but it's $799. So maybe the best bet is to check Facebook Marketplace, as was suggested by another. You might possibly find a preowned Lectric folder for $500 or $600.
I can picture that narrative...
"Oh, there goes a guy who looks almost as good as me. Not as well endowed as me... none of them are. And none of the females look anywhere near as lovely as you, dear." :)