The ruling on Hajj for one who has already performed the obligatory Hajj

Question: My mother has performed Hajj seven times. Is it permissible for me to perform Hajj on her behalf myself, or not?

Answer: Yes, it is permissible for you to perform an eighth Hajj or more on her behalf. This is part of being dutiful to her, and you will receive a great reward for it, provided that you have already performed Hajj for yourself, and that she has passed away or is unable to perform Hajj due to old age or an illness that is not expected to end. I ask Allah (Glorified and Exalted is He) to grant me and you understanding in His religion and steadfastness upon it.