What is the religious ruling on one who interferes and destroys homes through incitement, false dream interpretations, and encouraging a wife against her husband, and what is the best legitimate way to deal with this situation and this family?

It is your duty to advise your wife, who is negligent in her religious obligations by abandoning prayer and engaging in rebellious behaviors. If she rectifies herself, then that is good and excellent. Otherwise, it is better to separate from her, especially since divorce is recommended when the wife neglects the rights of Allah. As for the interference of relatives in a way that causes discord between you, this is impermissible. You must advise them and warn them of the grave consequences of such an act.