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It is not for the Prophet, and those who believe, to pray for the forgiveness of idolaters even though they may be near of kin (to them) after it hath become clear that they are people of hell 9:113
Trivia: What did Abraham do when it became clear that his father was an enemy of Allah?
If your fathers, and your sons, and your brethren, and your wives ... are dearer to you than Allah and His messenger ... then wait till Allah bringeth His command to pass." 9:24