How can my sone retrieve his Facebook password?

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Hi guys, my son is unable to log into Facebook as he has forgotton his Facebook password. He changed it ages ago and cannot remember what it is.

The email address he has set on my account is a really old Hotmail one which he can no longer log into. He does not have the friend thing set up as he didn’t know it existed and he also does not have a phone number on it.