How to Repent for Wronging One’s Parents

Question:
May Allah reward you with good. This brother, the questioner, says: Honorable Shaykh, what is the ruling on one who has wronged his parents by being deficient in his treatment of them, and a disagreement has started between them? Is repentance sufficient in that? And what reaches them from that?

Answer:
Whoever wrongs his parents in any way of wrongdoing, whether by speech, by action, or by treatment, this is undutifulness to parents; this is a type of undutifulness to parents. So he must seek their forgiveness if they are alive, or if one of them is alive, he must seek forgiveness from him, asking him for it. But if both parents are dead, or if one of them is dead and he wronged him during his lifetime, then the opportunity for his pardon has passed. However, he should make du'a for him, seek forgiveness for him, and give charity on his behalf, perhaps that will alleviate it for him, along with repentance to Allah the Exalted. Yes.