וַיֵּלְכוּ֙ גַּם־אֶחָ֔יו וַֽיִּפְּל֖וּ לְפָנָ֑יו וַיֹּ֣אמְר֔וּ הִנֶּ֥נּֽוּ לְךָ֖ לַעֲבָדִֽים׃
Da gingen auch seine Brüder hin, fielen vor ihm nieder und sprachen: Wir wollen dir Sklaven sein!
Rashi on Genesis
וילכו גם אחיו AND HIS BRETHREN ALSO WENT in addition to sending their messengers.
Chizkuni
וילכו גם אחיו, Joseph’s brothers also followed themselves after having sent ahead the sons of Bilhah. (They did after they saw him weep).