ANSWER:

If he doesn’t have a legitimate reason not to fast, you are sinful for serving him! 

My uncle didn’t fast in ramadhan.i will give the food for him.it is permissible for to gave or not.i am sinful for to give food

Fasting, Halal/Haram Matters | May 8, 2021 11:34 am
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My father is sick and will likely not be able to make up fasts. How to give food instead, does it have to be 1and half kilograms, do we give a one-time meal or groceries?
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I want to ask that should we open fast as soon as we hear the azaan or should wait for the sun to fully set.