His father is unable to do Hajj for health reasons, and he wants to do Hajj on his behalf

Question

Praise be to Allah.

If your
father is not able to do Hajj himself, because of old age or sickness for
which there is no hope of a cure and which makes him unable to do Hajj, then
he has to appoint someone else to do Hajj on his behalf, whether he appoints
you or someone else.

If you want
to do Hajj on his behalf, this is good, so long as you tell him that you are
going to do Hajj on his behalf and he gives you permission to do that.

Ibn Qudaamah
(may Allaah be pleased with him) said: If a person meets the conditions of
Hajj being obligatory for him, but he is unable to do it for a reason for
which there is no hope that it will disappear, such as old age or sickness
for which there is no hope of a cure, or he is too weak and cannot sit
firmly on his mount except with unbearable difficulty, or he is too old,
etc, if there is someone whom he can appoint to do Hajj on his behalf, and
he has enough money to do that, then he must do that. This is the view of
Abu Haneefah and al-Shaafa’i. End quote from al-Mughni (3/91).

He also
said: It is not permissible to do Hajj and ‘Umrah on behalf of a living
person without his permission, regardless of whether it is an obligatory or
voluntary Hajj, because it is an act of worship can be done by proxy, so it
is not permissible to do it on behalf of an adult of sound mind except with
his permission, as is the case with zakaah. In the case of one who is
deceased, it is permissible to do it on his behalf without permission,
whether it is obligatory or voluntary, because the Prophet (peace and
blessings of Allaah be upon him) enjoined Hajj on behalf of the deceased,
and it is known that permission cannot be sought from the deceased. End
quote from al-Mughni (3/95).

And Allaah knows
best.