nexus 9 skip google sign-in

I recently got given a nexus 9 by a family friend and I tried to set it up and it went fine until it got to the google sign in and it needed the original owners email and password, this tablet was owned by his son and they had created a google account for him. they can't remember the username and password they used. does anyone know how to bypass this or install a custom rom without access to the original OS?

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