Related for Yevamot 74:16
הכא אמר להו אייתו ראיה ושקולו
but they inherit from him',<span class="x" onmousemove="('comment',' Infra 100b. When he dies, the two groups of brothers, since they have exactly equal claims upon his estate, are entitled to equal shares in it. ');"><sup>28</sup></span> since here the case is just the reverse:<span class="x" onmousemove="('comment',' While in the Mishnah cited their claim is certain and his is not, in this case his claim is certain while theirs is not. His claim is certain since at all events he is entitled either to all the estate (if he is the son of the deceased) or to a part at least (if he is the son of the levir), their claim, however, is doubtful since it is possible that he is the son of the deceased and they, as the sons of the levir, have no claim whatsoever upon the estate. ');"><sup>29</sup></span>