Is it permissible for the sister of a deceased woman to perform the obligatory hajj on her behalf using funds provided by the deceased’s son? Kindly note that the deceased left no assets, the son has not yet performed his obligatory hajj, and the sister has already fulfilled her obligatory hajj.

There is no legal objection to the sister performing hajj again on behalf of her deceased sister using funds provided by the deceased’s son, provided the son donates the money specifically for his aunt to perform hajj on behalf of his mother. There is likewise no legal objection to this even if the son has not yet performed his own obligatory hajj.

And Allah Almighty knows best