Being a True Brother Is Extremely Important

Being called plain: אֲחוֹ תוֹ a sister is a big: שְּׁ בַ ח praise. Yaakov chose Yehuda for Malchus because he saved Yosef since: אָחִּינוּ בְּשָרֵנוּ הוּא וישב לז כז he is our brother and flesh, and Yaakov disapproved of Eisav since he didn’t act like a brother. (Rashi)