The proxy for stoning the pillars stones for himself first if he is obligated

Question: If a person acts as a proxy for his father and mother in stoning the pillars in addition to stoning for himself, is a specific order required for the stoning? Or is he free to prioritize whomever he wishes?

Answer: If a person acts as a proxy for his mother and father in stoning due to their inability or illness, he stones for himself first, then stones for his parents. If he starts with his mother, that is better because her right is greater. If he reverses the order and starts with his father, there is no blame on him. As for himself, he starts with himself, especially if he is obligated.
As for if he is performing a voluntary act, it does not harm him whether he starts with himself or with them, but if he starts with himself, that is better and more excellent. Then he stones for his mother, then for his father, in one station on the day of Eid. However, on days other than the day of Eid, the stoning is after the sun passes its zenith. He stones twenty-one pebbles for each of them every day. If he prioritizes stoning for his father over his mother, or prioritizes stoning for both of them over himself, provided he is performing a voluntary act. However, if he is obligated, he must start with himself, then stone for his parents.