I recommend they get a physical key (yubikey), it's more intuitive or natural for the pre-digital-first generations
Otherwise having same password on every service doesn’t look secure, and what would you need to do if it’s compromised.
Also, consider a legacy contact if you're in the Apple ecosystem. For those who rely on me as an unofficial trustee and guardian, I have them add me as their legacy contact, and I then print out multiple copies of the legacy contact key page, laminate it, and distribute it physically (it's a one page QR code with some details on it). It can also be bound between Apple accounts. A death certificate will be required to access a legacy contact.
laminated physical backup codes, you are a hero among peasants friend!