My 1 year old GS used to happily eat whilst we cared for him 1 day a week, but for the past month or so he refuses. He will eat for his mum & dad and also for his other grandparents. I don't force him and leave the food in a bowl so that he can help himself. We've even taken to eating in front of him in the hope of stimulating his hunger. He has plenty of water & milk bottles but just won't eat. If we offer food to him he has started to heave which I don't like and am careful that he doesn't get too much of a problem. 
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- you are doing everything right for your grandson jacee and as he is still drinking lots of milk he won't starve.