I have my recovery email but I can't remember my accounts email

I can't do the recovery form, I do not have the email the hacker changed it to. They basically removed my email from the account and added their email to the account.

Basically, when we first set up my account we used an email address that my dad created purely for the xbox account, but now we can't access the account because it has recently decided to ask to to sign in with the email or else I can't get online but my
dad doesnt remember the password, and he can't remember enough details to successfully fill out the recovery questionnaire. I've tried several different methods but none have worked.

I can't remember the email I had associated with the Gamertag so I don't know how I would complete the account recovery form.

I did try that but it says I have to contact the other email but I don't remember the other email...

I forgot the account and the video has his account already logged in mine is gone..Not in my account list.