Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 4 years ago
Bismihi ta'ala
After you have repented to God, if you have somehow wronged them, intentionally or unintentionally, then pray for them with doing dua for their soul.
If you can, visit their grave, and read some Quran over their grave. Pay some sadaqah on their behalf, or do some good deeds, and gift it to their soul.
Recite fatiha for them, whenever you remember them. Give out some food on their behalf, and gift its reward to them.
Be kind to their family members who are alive.
These are some of the things that are recommended to do. As you are sincere, in shaa Allah, the Almighty and the marhoom/marhoomah will forgive you.
And Allah knows best.