False claims of sincerity

قَالُوا۟ يَـٰٓأَبَانَا مَا لَكَ لَا تَأْمَ۫نَّا عَلَىٰ يُوسُفَ وَإِنَّا لَهُۥ لَنَـٰصِحُونَ

They said, "O our father, why do you not entrust us with Joseph while indeed, we are to him sincere counselors?