What's the name of this Robin Williams movie?!

Robin Williams has a wife, son and daughter!. Then somehow (I think a car accident) he and his two kids die!. They're in heaven with each other, and its like green hills everywhere with bunch of flowers (their own heaven)!. Then they know the mother is alone on earth and the movie focuses to her and how screwed up she is!. She tries to kill herself and I think she does, but doesn't get into heaven with her family!. At the very end, Robin Williams' character and the wife are reincarnated into a little boy and little girl playing with each other in a field!.Www@Enter-QA@Com

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