Is raising one's voice at one's father unintentionally, in a fit of rage while defending one's mother, considered an act of disobedience (ʿuqūq)?

This act of replying and raising your voice at your father is impermissible and constitutes sinful disobedience (uquq), and your anger at your brother does not justify your action towards your father. You must repent and seek forgiveness from your father, and gently explain your brothers' disobedience towards their mother.