Misty Dumplings

My grandma made dumplings and put coins in them. When she ate them, her wishes would come true. My dad ate the first one. He made a wish for a sports car and won one in the lottery that day. My aunt got the second coin and changed from a fat man of 200 kilograms to a skinny man of 90 kilograms. I ate the third coin and made a wish to make grandma healthy and live a long life. After hearing this, grandma looked at me with a livid face and her eyes were full of resentment. I was confused and decided to investigate the truth about the wish.