How to repent for one who was not dutiful to his father

Question:
This questioner, Sa'd Muhammad Ibrahim, is of Egyptian nationality. He says: My father passed away twenty years ago, but unfortunately, I was not dutiful to him. I treated him with extreme harshness, even though I was consistent in performing the prayers and doing good deeds. I am now regretful of what I did. Is there a repentance for me? I ask for your guidance, Your Eminence the Shaykh, and how should I act so that Allah forgives me? May Allah reward you with good.

Answer:
You must send blessings upon him and seek forgiveness for him, and ask Allah to pardon you and overlook your shortcomings. Give charity on his behalf, perform Hajj on his behalf, perform 'Umrah, and do good deeds. You are on the right path, with repentance and regret: repentance to Allah, regret for the shortcomings that occurred on your part, and asking Allah to overlook you (Exalted and Majestic is He). Along with that, do good deeds: send blessings upon him, make du'a' for him, seek forgiveness for him, give charity on his behalf, perform Hajj on his behalf, and perform 'Umrah on his behalf. All of this is good.

The presenter : May Allah reward you with good, Your Eminence the Shaykh.