Reference for Moed Katan 40:8

כי תניא ההיא לכבוד אביו ואמו

for whom a priest is to defile himself, a mourner is to observe [formal] mourning, namely, these: [For] his wife, father or mother, brother or [single] sister, son or daughter. To these they added: His brother or single sister from the same mother,<span class="x" onmousemove="('comment',' [Though not of the same father. The text implies only a paternal brother or sister.]');">¹²</span> as well as his married sister, be it from the same mother or the same father.<span class="x" onmousemove="('comment',' [Although the text speaks only of a single sister (ibid. v. 3) .]');">¹³</span>

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