Wa `alaykum as-salam wa rahmatullahi wa barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
Even though the basic principle is that a person should pay for his own Hajj if he is able to, performing Hajj with the brother’s money is valid. The person who does this will not be required to perform Hajj again out of his own money.
In his response to your question, Dr. Muzammil H. Siddiqi, Chairman of the Fiqh Council of North America, states:
If this person performed Hajj at his brother’s cost when he was a child, then he must perform the fard (obligatory) Hajj when he is able to do so.
However, if Hajj was performed when he was an adult, then he has fulfilled the obligatory Hajj.
Almighty Allah knows best.
Editor’s note: This fatwa is from Ask the Scholar’s archive and was originally published at an earlier date.