Related for Yevamot 74:22
לימא בפלוגתא דאדמון ורבנן קמיפלגי דתנן מי שהלך למדינת הים ואבדה לו דרך שדהו אדמון אמר ילך בקצרה וחכ"א יקח לו דרך במאה מנה או יפרח באויר
their shares in the estate of the levir after the levir had received his share in the estate of the deceased, the sons of the levir pleading, 'produce proof that you are our brother and you will receive [your share]', the 'doubtful son' can tell them, 'Whatever you wish: If I am your brother, give me a share among you;<span class="x" onmousemove="('comment',' And the half he already received he would return. This, of course, applies to the case only where one share in the levir's estate exceeds half the estate of the first deceased brother. ');"><sup>38</sup></span> and if I am the son of the deceased, return to me the half which your father received when he shared the estate with me'.