How can a woman perform Ruqyah for her husband who is afflicted by magic without his knowledge, and what is the cure for magic?

There is nothing in your husband's behavior towards his mother that should make you suspect he is bewitched, for honoring one's parents is a good quality enjoined by Islamic law. As for his extreme stinginess with you, it does not necessarily indicate that he is bewitched, as many husbands suffer from stinginess. We advise you to be frank with your husband and come to an understanding with him, as this is more appropriate than baseless suspicion.