Answered by Shaykh Amjad Rasheed
Is it permissible to supplicate for one’s relatives if they have died as non-Muslims?
It is permissible to supplicate that their punishment be lightened for them. As for praying that they be forgiven, taken out of the fire, and entered into Paradise, it is forbidden because of His Most High’s saying, “Surely, Allah does not forgive that anything be associated with Him.” (4:48)