Reference for Bava Batra 220:8

ברכה שאני:

Rabina said: [The law of a son's precedence may he inferred] from here: That is next to him,<span class="x" onmousemove="('comment',' Num. XXVII, 11. ');">¹⁵</span> i.e., he who is nearest in relationship takes precedence. And [in] what [respect is] the relationship of a son [nearer] than [that of] a daughter? [Is it] in that he is [entitled] to take his father's place in designating [the Hebrew handmaid of his father to be his wife]<span class="x" onmousemove="('comment',' V. supra p. 449. n. 12. ');">¹⁶</span>

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