it is not proper for the prophet and those who believe to seek forgiveness for polytheists even though they are close relatives after it has become clear to them that they have earned the punishment of hell.
ما كان للنبي والذين آمنوا أن يستغفروا للمشركين ولو كانوا أولي قربى من بعد ما تبين لهم أنهم أصحاب الجحيم