Tosefta к Кетубот 4:15

If he did not write for her "Male children that you will have from me will inherit the money of your ketubah over and above their inheritance portions with their brothers" (ketubat banin dikhrin), he is obligated [to follow that procedure anyway], since it is a stipulation of the court. All lands write like the people of Jerusalem. (This seems to be a comment on Mishnah Ketubot 4:12, what is reported their to be Jerusalemite practice is here endorsed for everyone, that widows will be financed from the dead husband's estate for as long as they live there).