וְאִם־אֵ֥ין ל֖וֹ בַּ֑ת וּנְתַתֶּ֥ם אֶת־נַחֲלָת֖וֹ לְאֶחָיו׃
און אױב ער האָט ניט קײן טאָכטער, זאָלט איר געבן זײַן נחלה צו זײַנע ברידער.
Mishnah Yevamot
If one has any kind of brother, [that brother] requires his brother’s wife to have yibbum, and he is his brother in every respect, except for a brother born from a female slave or a non-Jewish woman. If one has any kind of son, [that son] exempts his father’s wife from yibbum, and he is liable for striking or cursing [his father], and he is his son in every respect, except for the son of a female slave or a non-Jewish woman.