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The whole premise of the movie was that Tom Cruise's (Charlie Babbit) father died. Of course, he was extremely rich, but money wasn't what Charlie cared about. Charlie's father had a vintage car he never let him drive, and Charlie never spoke to him since he was 18. So when his father died and he found out he left the car in a will to an autistic man, Charlie had to get to the bottom of it. Charlie goes to "Rain man's" hospitality help and breaks him out.
The whole movie shows what it's like for someone with autism to experience the real world. Charlie has Rain man count cards, remember a telephone-book, and attempt socializing for the first time. It's a dramatic comedy that can touch your heart as you learn along the way the strong relationship Charlie and Rain man never knew they had.