Whoever represents someone else for stoning the Pillars along with stoning for himself, he begins with himself first

Question :

If a man is a representative for his father and mother for stoning the pillars along with stoning for himself, is he required to throw the stones in a specified order or is he given the choice in putting first whoever he wishes?

Answer:

If the man is representing his mother and father for the stoning due to their inability or illness, he throws for himself then he throws for his parents. If he begins with the mother (after himself) this is better, as her right is greater (than the father's). If he does it the other way around by beginning with his father (before the mother), there is no problem with that. In reference to himself, he should begin with himself first, especially if he is performing an obligatory Hajj.

However, if he is performing an optional Hajj, it does not harm him whether he begins with himself or with the parents, but if he begins with himself that is preferred and better. Then he should stone on behalf of his mother and then his father at one place of standing on the day of the "Eid (10th of Thul-Hijjah). However, on days other than the day of 'Eid, the stoning is after midday and he stones for each of them throwing 21 stones at each pillar. If he begins with some stones instead of others, there is no problem with that, and if he begins with the stoning for his father before his mother or he stones for them before himself, if he is performing an optional Hajj, there is no problem. However, if he is performing an obligatory Hajj, he must begin with. himself, then stone on behalf of his parents.

Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 4 Pages 168-169