|You may be right, which is why I mainly referred them to HP tech support.|
I would also say that the 'GrandBaby' would need to be significantly older than 1, 2, or 3 years old (Baby? Even 3 is not really a baby any longer) in order to be able change a password. Could many children younger than say 12 years old change a password without at least some help? What kind of grandparent could not convince a child to reveal or change back the password if they were able to in the first place? Punishment if normal reasoning does not work is always an option (loose a special privilege or planned outing).
To Everyone else::
Note that if you are using a computer in most family situations, there should be an administrator account that is not normally used and one or more user level accounts for normal daily use. This would always allow the administrator (parent with the most computer experience) to go in and fix problems, including repairing lost or changed passwords. This would also mean that most programs could not be installed without the admin password so you would have a say on what is installed on the computer.
You have to be a little bit crazy to keep you from going insane.