Does the reward for feeding a fasting person include all fasting people, or is it limited to those in need among them? Can the reward for feeding fasting people be dedicated to a sick father who is unable to perform acts of worship? And what else can be done to seek forgiveness for his sins and ensure a good end for him?

The reward for feeding a fasting person includes both the poor and the rich, though it is better to prioritize those in need. Scholars have differed on the issue of transferring the reward of an act of obedience to living individuals; the Hanafis and Hanbalis are of the view that it reaches them. You can dedicate to your father the reward of acts of worship that expiate sins, such as charity, Hajj, and Umrah (though there is a difference of opinion regarding whether these two expiate major sins). Increase your supplications for him for a good ending, particularly during times when prayers are answered. Prayer is not waived for your father as long as he is of sound mind, and he must fast if he is able. Religious obligations are waived if he is completely unconscious.