For a 3 year old boy...

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My uncle just passed away 2 weeks ago. One of the closest person to him is my nephew, his grandson. They used to spend most of the time together since my cousin and his wife are out all day because they have to work. When my uncle was about to be buried, I heard my nephew calling out his name as if trying to wake him up. Up to now, he is looking for his grandfather. I don't know how but maybe you can help me... How can you explain death to a 3 year old boy?