Should a person who has a permanent disability perform Hajj?

Q 1: I have a brother who had an accident that left him incapable to stand or walk or even serve himself. In general, the rest of his body is healthy, his mind is sound, and he is perfectly conscious of things around him, though he is often forgetful. His mother hired someone to perform Hajj on his behalf, is it permissible to perform Hajj on behalf of a living person? And is Hajj not obligatory on him in this circumstance, or does one of his relatives have to perform Hajj on his behalf? (Part No. 10; Page No. 56

A: If your brother is not capable of performing Hajj himself and his disability is permanent and hopeless to be removed, he should delegate someone to perform Hajj on his behalf, according to the Hadith in which: A man who said to the Prophet Muhammad (peace and blessings of Allah be upon him) that his father cannot sit firm on his mount, and asked whether he could perform Hajj on behalf of his father. The Prophet Muhammad (peace and blessings of Allah be upon him) said: "Perform Hajj and `Umrah on behalf of your father." If he delegates one of his relatives or others to perform Hajj on his behalf with his permission, there is nothing wrong with this according to the Hadith mentioned above.May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and his Companions.