Question 3: 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 Allaah 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.
Answer: Having performed Hajj on behalf of oneself, a person may perform Hajj on behalf of their mother and then on behalf of their father… read more here.