Prioritizing Obedience to Parents Over Voluntary Prayer

Question:
A father claimed that if he calls his son while he is praying the sunnah, the son must leave the prayer and respond to his father. He argued that responding to the father is obligatory and a fard, and that the fard takes precedence over the sunnah. What is the ruling? May Allah reward you with good.

Answer:
Yes, this is the principle. It is obligatory for him to prioritize obedience to his father over the voluntary prayer. This is the story of Jirjis that you have heard. Jirjis was praying a voluntary prayer and prioritized his prayer over his mother; consequently, he was punished because of her supplication against him.
However, if the father permits him to complete the prayer, that is better, so as not to interrupt his prayer. If the father calls him and permits him, knowing that he is praying, it is preferable for the son to say, "Let me finish," until the father permits him, so that his prayer is not interrupted. If the father does not permit him, he should break the prayer if it is a voluntary prayer.