corporation

My father has stated that he owns all the shares in a corporation but we cannot find the certificate proofing that. Is there a way to get a copy or other legal document that would show the percentage or number of shares owned by an individual in a privately held corporation/

Corporations must keep records of shareholders. So the corporate records would be the legal documentation you need. Every shareholder has a right to inspect the books and records of a corporation, so if he has any proof at all that he owns any shares, he has a right to see the books. If they will not let him see the books and if he has no documentary evidence of owning any shares, then he, or his lawyer would be able to subpoena the books and records in the event of a law suit, which your father could file against them.