Sibling rivalry and jealousy

قَالَ قَآئِلٌ مِّنْهُمْ لَا تَقْتُلُوا۟ يُوسُفَ وَأَلْقُوهُ فِى غَيَـٰبَتِ ٱلْجُبِّ يَلْتَقِطْهُ بَعْضُ ٱلسَّيَّارَةِ إِن كُنتُمْ فَـٰعِلِينَ

Said a speaker among them, "Do not kill Joseph but throw him into the bottom of the well; some travelers will pick him up - if you would do [something]."

قَالُوا۟ يَـٰٓأَبَانَآ إِنَّا ذَهَبْنَا نَسْتَبِقُ وَتَرَكْنَا يُوسُفَ عِندَ مَتَـٰعِنَا فَأَكَلَهُ ٱلذِّئْبُ ۖ وَمَآ أَنتَ بِمُؤْمِنٍ لَّنَا وَلَوْ كُنَّا صَـٰدِقِينَ

They said, "O our father, indeed we went racing each other and left Joseph with our possessions, and a wolf ate him. But you would not believe us, even if we were truthful."