Related על כתובות 13:10

Said Rabbi Yose son of Rabbi Yehudah: Admon and Hakhamim did not disagree (in Mishnah Ketubot about one whose father agreed [to add money in the dowry] for her that she is able to say: "My father agreed [this money] for me. What am I able to do? Either marry me or divorce me!" Regarding what [case] did they disagree? When she agreed to pay it herself. Admon says: She is able to say: "I thought my father would pay me, but now that my father is not paying me, what am I able to do? Either marry me or divorce me!" Said Rabban Gamliel: I agree with the words of Admon. One who agreed money for his minor daughter [in her dowry] and then tried to weasel out of it, they force him to pay, for one can act [in a minor's] favour but not to their detriment.