I have the same problem with my parents and I initially thought the Windows 10 pin screen was quite good for this. You only need 4 numbers, I set it to my birth

I have the same problem with my parents and I initially thought the Windows 10 pin screen was quite good for this. You only need 4 numbers, I set it to my birthdate and it's made things somewhat easier for them. That was until my mom phoned me telling me her keyboard was broken. Took me a while to diagnose that she was trying to enter letters into the pin-field and it gave no indication that you weren't supposed to do that, it just didn't input any characters. Also turns out the Windows account metaphor has gotten really confusing since they introduced microsoft accounts that are both local and online but don't necessarily share the same characteristics and now you have like 3 different passwords for the single "account" concept.