I need to know what will be the kaffara for missed fast of my father who expired last year for each missed fast? And to whom I can pay who kaffara? He used to get ill when fasting. May be some missed intentionally

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If he was an old man, then no need to pay any kaffarah.
The only thing needed is to feed a poor person per day, with 750 gms of flour, rice, or dates.