Tafsir of Yusuf 12:11

Appearing in the fifth (111) and sixth (112) verse is the request of these brothers before their father in which they wondered why he would not trust them with Yusuf, although they wished him fully well. So, they pleaded, he should send him along with them to enjoy himself freely by eating and drinking and playing with them and that they all shall be there to take care of him.

The tone of the very request made by the brothers of Sayyidna Yusuf (علیہ السلام) indicates that they had already made such a request earlier too which was not accepted by their father. Therefore, in the present request, they seem to have tried to assure their father with added effort and insistence.