Performing additional voluntary Hajj on behalf of my Mother
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Question: My mother performed the Hajj seven times, so is it permissible for me myself to perform (another) hajj on her behalf?
Yes, it is permissible for you to perform (another) hajj on her behalf - an eighth hajj or more - and this is from kindness (and honouring) towards her, and there is great reward in that for you if you have (already) performed the (obligatory) hajj for yourself.
Shaykh Ibn Baaz
Majmoo' Fataawa wa Rasaa.il 'Abdul-'Azeez ibn Baaz - Volume 16, Page 405