Is it permissible to visit, eat, and drink at the home of an illiterate woman who claims to treat people and solve their problems with "the Qur'an," knowing that she considers this "a provision from Allah" and that relatives have tried to advise her without success, and that the question stems from the fear of displeasing Allah by severing ties of kinship?

If "al-Fattahah" means opening the Mus'haf to know unseen matters, or seeking help from jinn, or claiming knowledge of the unseen, then it is forbidden soothsaying (kahanah), and whoever believes a soothsayer has disbelieved in what was revealed to Muhammad, peace and blessings be upon him.

Regarding the matter of associating with them and eating and drinking with them, what is most beneficial for maintaining ties should be considered. If boycotting them helps to deter them from forbidden acts, then that is better. But if being close to them enables advising them, then that is more preferable. As for eating and drinking, if all their earnings are from forbidden sources, then it is unlawful (haram). If most of their earnings are from forbidden sources, then it is disliked (makrooh), unless the food is specifically purchased with unlawful money, in which case it becomes unlawful.