Surah Al-Mu'minun Verse 101

فَإِذَا نُفِخَ فِي الصُّورِ فَلَا أَنْسَابَ بَيْنَهُمْ يَوْمَئِذٍ وَلَا يَتَسَاءَلُونَ

So when the Horn is blown, no relationship will there be among them that Day, nor will they ask about one another