The ruling on performing Hajj on behalf of a living person, and the ruling on a person performing Hajj on behalf of another if he has not performed Hajj for himself

Question:
May Allah reward you and bless you. This questioner, Honorable Shaykh, is a Sudanese resident of al-Dawadimi. He says in this question: Is it permissible for me to perform Hajj on behalf of my father, knowing that he is unable to do so, while I, praise be to Allah, am able to perform Hajj here in the Kingdom, knowing that I have not yet fulfilled my own obligation of this great pillar?

Answer:
It is not permissible for you to perform Hajj on behalf of anyone else until you have first performed Hajj for yourself. That is one aspect.
The second aspect is that if your father is able to travel for Hajj, he should come. If you wish to be dutiful to him and do him good, you bring him and spend on him, and he performs the Hajj. However, if the father is alive but unable to attend due to a health impediment or a physical impediment that prevents him from attending, and this impediment is continuous and not expected to end, such as an elderly old man or a patient with a chronic illness from which recovery is not expected, then there is no harm in performing Hajj on his behalf after you have performed Hajj for yourself. But you must take authorization from him; you take authorization from him, perform Hajj on his behalf, and thereby you have been dutiful to him and done him good. As for if he is dead, the only condition is that you have first performed Hajj for yourself, and then you perform Hajj on behalf of the deceased. Yes.