So an update of the event, in the end I brought a Xiaomi Pad 6 home and my parents love it as they've used Xiaomi phones before and get the hang of it pretty quick. I can now keep the Samsung tablet I bought just in case😎
Thanks for all the advice and feedback! Granted that it's not that secure running an extremely old android system, but in reality the devices will only be turned on for no more than 4 hours a month, I don't think it's a big concern. I think I'd use via for browsing and newpipe for YouTube as they seemed to still support old systems and are relatively light-weight. I'd let you guys know how it went down if possible.
So an update of the event, in the end I brought a Xiaomi Pad 6 home and my parents love it as they've used Xiaomi phones before and get the hang of it pretty quick. I can now keep the Samsung tablet I bought just in case😎