Related for Kiddushin 151:12
רב אדא בר אהבה תני ד' אמהות שהם שתים עשרה במתניתא תנא ד' אמהות שהם שש עשרה בשלמא לרב אדא בר אהבה
<big><b>GEMARA: </b></big>Why are the women investigated but not the men? - When women quarrel among themselves, they quarrel [only] about immorality,<span class="x" onmousemove="('comment',' One accuses the other of immorality, but not of a blemished descent.');"><sup>24</sup></span> so that if there is anything,<span class="x" onmousemove="('comment',' Objectionable in their pedigree.');"><sup>25</sup></span> it is not generally known.<span class="x" onmousemove="('comment',' Lit., 'it has no voice.'');"><sup>26</sup></span> But when men quarrel among themselves, they quarrel over birth;<span class="x" onmousemove="('comment',' Each throwing up the other's blemished descent.');"><sup>27</sup></span> if there is anything, it is generally known. Now, let her too investigate his [forbears]? - This supports Rab. For Rab Judah said in Rab's name: Fit women were not admonished not to marry the unfit.<span class="x" onmousemove="('comment',' V. supra p. 373, n. 1. - Hence it is unnecessary for her to investigate his ancestors.');"><sup>28</sup></span> R'Adda B'Ahabah recited: Four mothers, which are twelve.<span class="x" onmousemove="('comment',' Adding one mother to each. V. p. 388, nn. 9 and 10.');"><sup>29</sup></span> In a Baraitha it was taught:' Four mothers, which are sixteen.<span class="x" onmousemove="('comment',' Adding one more mother and the grandmother to each.');"><sup>30</sup></span> Now, as for R'Adda B'Ahabah, it is well;