Now, you're saying grandkids may read this and possibly do something naughty or mess around with the settings ?/
Oh dear, this is getting confused
Actually, in my last contribution I was saying that YOUR suggestion, of a 'self-revealing' password (eg a hint saying 'the password is
dog') was unattractive to me because it meant grandkids could do naughty things, they'd be able to log and change setting in just by going to the home page and asking for the hint. As long as they have to ask for the password, or at least have to ask for access to the router, such mischief is a lot less likely.
I remain happy, and have never budged from being happy, with the plan at post #8 of writing a new password on a sticky label. Plan (b) would be a factory reset when I'm done, though I'd rather avoid that as it stops me from making any changes, such as tightening the firewall if I consider it to be needed.