Is it obligatory to obey one’s parents in everything, even if they command one to abandon a supererogatory act such as a voluntary fast or a supererogatory prayer? And is their obedience binding in abandoning the Hajj on behalf of one’s grandmother if they refuse on the grounds that her children have a greater right to her?

Obeying parents is obligatory in matters that benefit them and do not harm you. However, if they command you to abandon supererogatory acts (Nawafil), we examine the situation: if they need work that you are not doing because you are preoccupied with supererogatory acts, then obey them. But if the reason for their command is their dislike for supererogatory acts, then do not obey them, but rather appease them as much as you can.

Therefore, perform Hajj on behalf of your mother. If your father forbids you, tell him, "I will not perform Hajj," intending by that the coming year. This is not a lie if interpretation is possible.

Similarly, it is not obligatory to obey parents in divorcing one's wife if there is no legitimate Shariah reason necessitating the divorce. This situation cannot be compared to Umar's command to his son to divorce his wife, because Umar's command was based on a legitimate Shariah reason.