A person is required to make Du`a' (supplication) for their parents and grandparents. What is the ruling on making Du`a' for those who did not support or love the callers to Tawhid (belief in the Oneness of Allah/ monotheism) as was said by their contemporaries?
It is not permissible to make Du`a' for a person who dies as a disbeliever. If a person is still alive and is a disbeliever or sinful, we should ask Allah to guide them. When a person who believes in Tawhid dies, it is permissible to make Du`a' for them and the same goes for those who profess Islam but we are unaware of their real intentions. (Part No. 24; Page No. 221) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.