The Ruling on Performing Hajj on Behalf of a Deceased or Incapable Relative

A message was sent from Baghdad by one of the female listeners. The message consists of two pages, and its summary is that their aunt raised them with good upbringing, and they praise her for it. At the end, they ask if their aunt has already performed the obligatory Hajj, whether they can perform Hajj on her behalf as well? And they ask about the hadith of the Messenger of Allah (peace and blessings be upon him): And is the intended meaning of "righteous child" the child of the person himself, or the child who was raised by his caretaker, as that aunt did?
Answer: First, it is prescribed for them to make du'a for her, to seek mercy for her, and to give charity on her behalf in return for her kindness, if she is a Muslim. They should make du'a for her, seek mercy for her, and give charity on her behalf, because she did good. And Allah says: [Al-Rahman: 60]. So the one who does good should be rewarded and compensated. And it is authentic from the Messenger of Allah (peace and blessings be upon him) that he said: So she is a doer of good, and it is prescribed for them to do good to her, to give charity on her behalf, and to make du'a for her. And Hajj is included in that. If they perform Hajj on her behalf while she is dead or incapable of performing Hajj due to her old age, then the Hajj performed on her behalf will benefit her. This is among the great acts of closeness to Allah.
As for the child who makes du'a for a person, this refers to his own child, his direct descendant. If he makes du'a for him, this is what benefits him. For this reason, he said: or meaning: the child of the deceased himself, and the children of his daughters, and the children of his sons from his lineage. If the children of his sons, the children of his daughters, and their children, no matter how far down the line, make du'a for him, they are all included in this. Yes.