Ruling on working in establishments that contain forbidden items

Your Eminence! My father has a shop for selling electrical appliances such as: televisions, video equipment, and some musical instruments, as well as gold watches. He asks me to sit in it and sell, but I refuse. Is this considered undutifulness to parents? And what is obligatory for me?
This is not undutifulness to parents, if you refrain from doing the forbidden thing that your father does.But it is obligatory for you to advise him and say to him: This is forbidden, and its earnings are forbidden. If he guides himself, that is what is required. If he does not guide himself, the sin is upon him, and you have a reward for advising him; for Allah the Exalted says to His Prophet (peace and blessings be upon him): [al-Baqarah: 272] ,And when he said: Sit in the shop to sell, but do not sell the items that are used for a forbidden purpose. Sell the items that people generally use for a permissible purpose, such as radios and recorders. As for video equipment and televisions, do not sell them; because most of those who buy these items use them for a forbidden purpose.