Ignorance Of Hazrat Nooh A.S.?
Or no knowledge of what Hazrat Nuh (as) said in the previous ayah about his son being his family. So Allah is basically telling him that blood relationships arent the criteria for who gets saved in the azaab but the deeds – and that your son is definitely not from among those of your family that should be saved. Please clarify @AhmadShoaib