Tell your dad he doesn't know stuff about computers and is just a paranoid man who spends all his time wasting his life in an office.
Or whatever his job is.
starfish.
"You don't know much about computers, you are a waste of life and space"
This statement is completely incorrect, there are many successful, important people who don't know much about computers.
Anyway, the password is most likely "administrator" and the username is most likely also "administrator"
Your father isn't wrong for being overcautious.