Is the son's failure to visit his father, on the pretext of not angering the mother who describes the father as bad and distant from them, considered disobedience to the father?

If the father is remiss in his duties towards his children, this does not negate the obligation to honor him and treat him kindly. The mother has no right to prevent the children from maintaining ties with their father. The children can maintain ties with him without her knowledge to avoid her anger, and they should strive to gain her رضا (رضا) by showing affection and kindness. It is not permissible for the mother to incite her children against their father, and her speaking ill of him is backbiting. Her accusation that he and his wife practice magic is a forbidden evil suspicion.