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I feed my cats dry food in the morning and then leave out canned/wet food for the rest of the day and I've never had this problem. Wet food is better for them anyway due to the high water content (cats are prone to kidney disease/failure when older) and because it's diluted with a lot of water, there are less calories in the same amount as dry food. So, it would be difficult for your sister's cat to gain more unneeded weight and at the same time, there would be food always available. Other than that, feeding on a schedule might help, as others have pointed out, and just ignore him when he meows for food.
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