If it’s a private company all you need is your father assuming he is the sole director to appoint you as a director. You then avail that information to the registrar of companies. If your dad was running the company in a very professional manner then have your name in the Register of Directors, sign the conflict of interest document, pass a resolution to amend the company’s constitution to increase the number of directors, avail all this including your details ie age, occupation and address to the Registrar of companies…ukishindwa na hii yote ho to the Registrar of Companies aku guide