Laptop password at once?

My sister was working on her laptop and suddenly there's a password inside although she never had one and none was how it works on her own and what can you do she never had a password inside

Maybe your father did it so secretly that your sister was no longer allowed to use the laptop.

What operating system do you have?

Your laptop alone won't do that. What may have happened:

For Windows:

Signed in with a Microsoft account? → use the password

PC reset → use old password

Your sister was just on your laptop.

Since it is not reprehensible that a password is now set.

Windows CHICAGO

or LONGHORN