Is my father's money, earned from selling cameras and their accessories, unlawful? And if so, what should I do, given that he cannot change his profession and I cannot refrain from taking money from him?

Selling photographic and video cameras, and the money earned from them, is a matter of scholarly disagreement regarding its permissibility. However, if it is highly probable that they will be used for unlawful purposes (such as photographing unveiled women), then it is prohibited to sell them to someone about whom this is suspected. If the seller is unaware of the buyer's intentions, they are not obligated to investigate, unless they are in a country where it is predominantly used for unlawful purposes. In such a case, it is not permissible for the seller to sell them except to someone they know will not use them for unlawful purposes. Earning from the sale of cameras is not free from doubt, and it is better to avoid it.