Parental favoritism and family discord

ٱقْتُلُوا۟ يُوسُفَ أَوِ ٱطْرَحُوهُ أَرْضًا يَخْلُ لَكُمْ وَجْهُ أَبِيكُمْ وَتَكُونُوا۟ مِنۢ بَعْدِهِۦ قَوْمًا صَـٰلِحِينَ

Kill Joseph or cast him out to [another] land; the countenance [i.e., attention] of your father will [then] be only for you, and you will be after that a righteous people."