Using password managers. All of my friends and family refuse to use them but always complain about getting locked out of accounts due to forgetting login details. I leave them too it now.
Honestly, get them to use the built in password manager in their browser. It's a huge step up from reusing passwords which they're almost certainly doing, so it's a case of not letting perfect be the enemy of improvement
What do you do when you need your password while out of the house? Because if you bring your notebook, then you've INSANELY decreased your security (forgotten, bag where it's in forgotten, left lying around open, looking at it while people can check over your shoulder, it gets wet/damaged, etc.)
I don't need the passwords while I'm out and if it is really important it will will have to wait, if it is really really important then I will go home and get it, but in reality it is almost always never really that important.