Is it obligatory to continue fasting a vow, or is the paid expiation valid, and is the fasting obligation absolved upon death?

If someone vows an act of obedience, such as fasting, and conditions it upon the occurrence of a permissible matter, then they must fulfill it. If they are unable to fulfill it, they must offer an expiation for a broken oath (kaffarat yameen). So, if the vow was to fast, conditioned upon the son entering the Faculty of Engineering, then the one who made the vow must fulfill it, unless they are unable to do so, in which case an expiation for a broken oath suffices. If the one who made the vow has already offered expiation while being unable to fast, then it is sufficient for them; otherwise, it is not sufficient, and they must make up the fast. If they are continuously unable to fast, then they must offer expiation. The vow ends with death, and the relatives of the deceased are not obligated to do anything regarding this vow, unless the deceased broke their fast on days while they were able to fast and did not make them up before death. In that case, either food for one poor person for each day is taken from their inheritance, or one of their relatives fasts on their behalf.