Doc Rivers often thinks about his father, a former Chicago police lieutenant who taught him life lessons that the Celtics coach relies on to guide his team.Grady Rivers preached patience, consistency and hard work. He juggled his schedule so he could watch his son's games. He coached his kid's baseball team and proudly watched Doc become a college star, NBA player and grow into a respected family man.In November, Grady Rivers died following a brief illness.Doc Rive

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