Is it permissible to share the costs of the husband's Hajj if he is accompanying a woman performing Hajj on behalf of her deceased mother, given that both of them have previously fulfilled their obligatory Hajj?

A woman may perform Hajj on behalf of her mother if she has already fulfilled her own obligation. Hajj must be performed on behalf of the deceased mother from her estate if Hajj became obligatory for her and she did not perform it, or if she vowed to perform it and did not fulfill her vow, regardless of whether she bequeathed it or not.

The heirs are not obligated to pay for the husband's Hajj on behalf of the deceased mother, as he can perform Hajj for her himself, provided he has already performed Hajj for himself, or another person can be hired for that purpose.

If the mother does not have an estate, the heirs are not required to bear the costs of Hajj on her behalf.