וַיֹּ֤אמֶר פַּרְעֹה֙ אֶל־יוֹסֵ֔ף אֱמֹ֥ר אֶל־אַחֶ֖יךָ זֹ֣את עֲשׂ֑וּ טַֽעֲנוּ֙ אֶת־בְּעִ֣ירְכֶ֔ם וּלְכוּ־בֹ֖אוּ אַ֥רְצָה כְּנָֽעַן׃
און פַּרעה האָט געזאָגט צו יוֹספֿן: זאָג צו דײַנע ברידער: טוט אָט-װאָס: לאָדט אָן אײַערע בהמות, און גײט, קומט קײן לאַנד כּנַעַן,
Radak
טענו את בעירכם, the word טען is an expression for “loading;” we find it used in this sense in Sanhedrin 32 אחת טעונה ואחת שאינה טעונה, “one which was loaded whereas the other was not loaded.” My grandfather of blessed memory explained the word טען as related to Isaiah 14,19 מטועני חרב, meaning that something had been stabbed, pierced. Accordingly, Joseph urged his brothers to spur on their beasts of burden by means of the דרבן, a spur or goad in order that the good news of his survival should reach his father sooner. Rabbi Saadyah gaon also translated the word in this fashion into Arabic.
Sforno
אמור אל אחיך זאת עשו, this is what should be your purpose to take your father and your families, etc.