Is a wife obligated to seek a divorce from her Sufi husband who believes in saints and righteous people, travels to their graves, and compels her to read weak Sufi books, especially given her fear for their son regarding these beliefs?

Traveling specifically to visit graves and seeking blessings from them or from righteous individuals is forbidden. The man must repent from these sins because worship is done according to what Allah has legislated, and whoever performs an action that is not in accordance with the Prophet's command, it will be rejected. He must also repent from slandering scholars, because persistence in this could lead to disbelief. As for the wife, she must continually advise her husband, and if he does not repent and she fears that he will compel her to commit sin, then she has the right to seek divorce.