Is a reaction of disdain towards one's father considered sinful, and is severing ties with one's brother considered a severing of kinship (qatiʿat raḥim)? What is the religious ruling on the father's actions, in the context of a daughter who feels contempt and disgust towards her father and brother due to their shortcomings and her brother's open commission of sins, and her father's failure to confront him, which has affected her psychological state and led her to consider separating from them?

The brother is in grave danger due to his denial of Islamic rulings and his abandonment of prayer. He must be advised in the best possible manner. If this does not work, then boycotting him is permissible if there is hope of it benefiting him. The father must advise his son and be firm with him. He is not permitted to assist him with money that would help him in disobedience, or to take from his daughter's money to give to the son. Disliking the father's actions in one's heart carries no sin, but one must avoid anything that would harm him, such as boycotting him or ceasing to speak with him. It is permissible to live alone in a safe dwelling if harm is feared, but patience and seeking help from the righteous are better.