Shiekh, Doesn’t Allah forgive the one who misbehaves with his parents and then seeks forgiveness to Allah? as he feels bad after that.
It is one of the major sins and the person must ask for forgiveness from his parents and show them how guilty he’s for behaving in such a sinful manner that leads straight to hell. If they forgive him then only he has a chance of being forgiven by a Allah.
He must make them happy, exactly the way he made them sad.