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I don't know about reporting him, though. He may turn bitter towards you. He's old. Just let him do his thing. He has been on this planet for this long. He must be doing something right, huh?

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This is indeed a hard decision to make... If he's really bringing other people and himself into danger it's probably the right thing to do. First it's a good idea to have a long serious talk about this with him because he might not even realize how dangerous it is what he's doing. Also bring up the subject of that you were thinking about reporting this and also that you don't want to loose your father in some accident because he drives dangerous.

good luck man