Related for Ketubot 10:1
מִי שֶׁהָיָה נָשׂוּי שְׁתֵּי נָשִׁים וּמֵת, הָרִאשׁוֹנָה קוֹדֶמֶת לַשְּׁנִיָּה, וְיוֹרְשֵׁי הָרִאשׁוֹנָה קוֹדְמִין לְיוֹרְשֵׁי שְׁנִיָּה. נָשָׂא אֶת הָרִאשׁוֹנָה וָמֵתָה, נָשָׂא שְׁנִיָּה וּמֵת הוּא, שְׁנִיָּה וְיוֹרְשֶׁיהָ קוֹדְמִים לְיוֹרְשֵׁי הָרִאשׁוֹנָה:
If a man were married to two women and he died, the first comes before the second (in collecting her kethubah), and the heirs of the first come before the heirs of the second [if his wives died after him before they had collected their kethubah.] If he married the first and she died, and then he married the second and he died, the second and her heirs come before the heirs of the first. [For she (the second) is a creditor, whereas the heirs of the first come to inherit from their father the kethubah of "the male sons," concerning which it is written (in the kethubah): "They shall inherit." For this reason the debt is paid first, and they inherit what is left. And it is only when the second swore (that she had not collected) the kethubah that she or her heirs take her kethubah. But if she had died after her husband and had not sworn, her heirs take nothing of her kethubah, the ruling being that "a man does not bequeath an oath to his sons"; that is, money which is acquired only by an oath. If he died before he swore, that money is not bequeathed to his sons.]