Is the father obligated to pay expiation on behalf of his daughter who has diabetes and is unable to fast, and is this expiation considered a mandatory expense or a debt upon her until she possesses her own money?

If the girl is an adult and suffers from an incurable illness that prevents her from fasting, she is obligated to pay the fidyah (expiatory feeding). This is the feeding of one poor person for each day, approximately half a sa' (about 1.5 kg of rice). This can be gathered and given to one poor person or to several, and it is permissible to cook the food or to provide ready-made meals.

The fidyah is due from the girl's own money. It is permissible for the father or another person to donate it on her behalf with her knowledge. If she has no money and no one donates it, some jurists say it remains a debt upon her, while others say it is waived due to inability, and this is the more sound opinion, because obligations are waived due to inability to fulfill them.

The father or anyone else is not obligated to pay the fidyah on behalf of his daughter, wife, or mother, because the fidyah is an act of worship specific to the accountable individual himself and is not considered part of financial maintenance.