Responsa for Bava Batra 315:1
<big><strong>מתני׳</strong></big> נפל הבית עליו ועל אשתו יורשי הבעל אומרים אשה מתה ראשון ואחר כך מת הבעל יורשי אשה אומרים בעל מת ראשון ואחר כך מתה אשה
<b><i>MISHNAH</i></b>. IF THE HOUSE COLLAPSED UPON A MAN<span class="x" onmousemove="('comment',' Lit., 'upon him'. ');"><sup>1</sup></span> AND HIS WIFE<span class="x" onmousemove="('comment',' From whom he had no children. ');"><sup>2</sup></span> [AND] THE HEIRS OF THE HUSBAND<span class="x" onmousemove="('comment',' His sons, e.g., that were born from another wife or his father and brothers. ');"><sup>3</sup></span> PLEAD [THAT] THE WIFE DIED FIRST<span class="x" onmousemove="('comment',' And her estate was consequently inherited by her husband before he died. ');"><sup>4</sup></span> AND [THAT] THE HUSBAND DIED AFTERWARDS,<span class="x" onmousemove="('comment',' And, consequently, his heirs are entitled to his estate including all that he inherited From his wife. ');"><sup>5</sup></span> [WHILE] THE HEIRS OF THE WIFE<span class="x" onmousemove="('comment',' Her relatives who are not related to her husband. ');"><sup>6</sup></span>
Teshuvot Maharam
A. An apostate forfeits his rights as an heir, although he has the power to transmit his property to his Jewish heirs. Since it is not known whether A's daughter apostatized after her parents were killed, and thus inherited the property from either parent and upon apostatizing transferred it to A's brother, or that she apostatized before they were killed, her survival does not change the status of the estate. Therefore, the estate should be divided in the following manner: The amount recorded in L's ketubah as dowry, shall be divided equally between her brother and A's brother; L's private property, if any, shall go to her brother, while the remaining property shall go to A's brother. However, if A's daughter is still a minor, the estate should not be divided until she reaches majority. Then, if she still persists in her apostasy for one hour, the estate must be divided between the brothers; for a minor does not forfeit her rights as an heir upon apostatizing, since the persuasion of a minor is tantamount to inexorable compulsion.
The author adds: For further details see the Responsum appended therewith which I have sent long ago to Frankfort regarding a similar question.
SOURCES: Cr. 82.