וַיֹּאמְר֗וּ שְׁנֵ֣ים עָשָׂר֩ עֲבָדֶ֨יךָ אַחִ֧ים ׀ אֲנַ֛חְנוּ בְּנֵ֥י אִישׁ־אֶחָ֖ד בְּאֶ֣רֶץ כְּנָ֑עַן וְהִנֵּ֨ה הַקָּטֹ֤ן אֶת־אָבִ֙ינוּ֙ הַיּ֔וֹם וְהָאֶחָ֖ד אֵינֶֽנּוּ׃
그들이 가로되 주의 종 우리들은 십이 형제로서 가나안 땅 한 사람의 아들들이라 말째 아들은 오늘 아버지와 함께 있고 또 하나는 없어졌나이다
Mishneh Torah, Levirate Marriage and Release
Maternal brothers (ie brothers through the mother) are not considered to be brothers (except for mourning and testimony (were they will be) but) with regard to inheritance or Yibum and Chalitzah they are considered as if they were not [brothers], because you are only considered brothers from the father.