Performing Hajj on behalf of his sister who bequeathed it before doing it on behalf of his mother

Q 1: What is the ruling on my sister's bequest that I should perform Hajj on her behalf? Is it obligatory for me to perform Hajj on her behalf before performing Hajj on behalf of my mother and then on behalf of my father - if Allah wills that I do so? Or, should the bequest be enforced by my sister's son who now lives in the Kingdom? I mean that each of us should perform Hajj on behalf of his mother.

A: Having performed Hajj on behalf of oneself, a person may perform Hajj on behalf of their mother and then on behalf of their father. As for your sister, it is her son who is to perform Hajj on her behalf. However, you may, if you so wish, perform Hajj on her behalf if her son refuses to do so. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.