Mishnayos Kesuvos Perek 12 Mishnah 2

If the daughter was married during this period, her husband provides her with the sustenance customarily provided by a husband for his wife, and the two men obligated to sustain her due to agreements with her mother provide her with the monetary value of the sustenance. If the two husbands of the mother died, their daughters are sustained from unsold property, and she, their wife’s daughter, whom they agreed to sustain, is sustained even from liened property that was sold. This is due to the fact that her legal status is like that of a creditor, given that he is contractually obligated to support her. The perspicacious ones would write an explicit stipulation into the agreement: I agree on the condition that I will sustain your daughter for five years only as long as you are with me. Then they would not be obligated to sustain a girl who is not their daughter when they are no longer married to the girl’s mother.

נִשֵּׂאת, הַבַּעַל נוֹתֵן לָהּ מְזוֹנוֹת וְהֵן נוֹתְנִין לָהּ דְּמֵי מְזוֹנוֹת. מֵתוּ, בְּנוֹתֵיהֶן נִזּוֹנוֹת מִנְּכָסִים בְּנֵי חוֹרִין וְהִיא נִזּוֹנֶת מִנְּכָסִים מְשֻׁעְבָּדִים, מִפְּנֵי שֶׁהִיא כְבַעֲלַת חוֹב. הַפִּקְחִים הָיוּ כוֹתְבִים, עַל מְנָת שֶׁאָזוּן אֶת בִּתֵּךְ חָמֵשׁ שָׁנִים כָּל זְמַן שֶׁאַתְּ עִמִּי: