LOL! So, this used to happen a lot when the kids wanted to play with the grandparents phones. So, I explain nicely to everyone that the devices are out of bounds for everyone and no-one touches the devices any more. That solves that. However, on rare occasions, there are needs to enter the Apple password -- my wife have a few other cousins who helps out. For parents with no access to external help, I suggest printing out on a paper and keeping it safe (use a font-size large of a serif fonts). If your local language is not English, complex password but based off the local language are easier -- (in locale) my dear friend's NAME that died during WWII on this DATE, etc. ;-)
Update: For cultural context and to avoid confusion with others around the world who have separate living spaces, my in-laws lives in a pretty large sprawl of almost a colony on their own with their brothers, sisters, cousins, and the entire families. On Google Maps, I had actually named the central home of that locality (my in-laws) to a specific name based on their family name -- making it easy for deliveries by post (Amazon, Post Office, Air Cargo deliveries, etc). In that part of the world, addresses are not precise and still goes on word of mouth.
Update: For cultural context and to avoid confusion with others around the world who have separate living spaces, my in-laws lives in a pretty large sprawl of almost a colony on their own with their brothers, sisters, cousins, and the entire families. On Google Maps, I had actually named the central home of that locality (my in-laws) to a specific name based on their family name -- making it easy for deliveries by post (Amazon, Post Office, Air Cargo deliveries, etc). In that part of the world, addresses are not precise and still goes on word of mouth.