What is the guidance for one whose parents have died and he has boycotted them, and he is remorseful for that?

Question:
May Allah reward you with good, and may He do you good. If I wronged my mother and father, and they died, and I was boycotting them, will Allah forgive me regarding the rights of the deceased if I seek His forgiveness?

Answer:
The rights of people are not forgiven unless they pardon. If they pardon it. So if you have a right owed to a created being, it does not drop from you except by fulfilling it or by the pardon of its owner.
But as for one who dies and there is one who died and he has a right over you, if this right is financial, then you fulfill it to his heirs. And if this right is non-financial, meaning you spoke about his honor, or you were harsh with him, or something similar, then you seek forgiveness for him, make du'a for him, and give charity on his behalf, so that perhaps Allah (Glorified and Exalted is He) will lighten that for you. And among that is the right of the parents; it is a matter above all else.
It does not drop except by their pardon. But if you make du'a for them, seek forgiveness for them after their death, give charity on their behalf, and perform Hajj for them—whether voluntary Hajj or obligatory Hajj if they had not performed Hajj for themselves—then that is part of being dutiful to them. Likewise, if you pay off the debts they owed and fulfill the bequests they made in the prescribed manner, then that is part of being dutiful to them and doing good to them. We ask Allah to pardon us and you.