ما هي أفضل طريقة استغفار للوالدين؟

Allah has commanded righteousness towards parents, being good to them, and supplicating for them for mercy, both when they are alive and when they have passed away. Supplicating for them for mercy and forgiveness is sufficient. If they have passed away, then part of being righteous towards them is fulfilling their covenants, maintaining ties with their kin, and giving charity on their behalf.