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Susan Buffett didn't find out her father, billionaire Warren Buffett, was rich until her early 20s, and she definitely didn't hear it from her parents. "I didn’t really have any idea about any money until I was long out of high school and out of Omaha," Susan recently told Business Insider. "There was an article in the Wall Street Journal at one point when I was probably about 22 or 23, I'd say. That was the first time I was like, 'Oh, there's more going on than I knew about!'" The founder of the Sherwood Foundation, a children's charity, Susan takes part in a portrait of her father, HBO's "Becoming Warren Buffett," which premiered Monday. In the documentary, Susan provides intimate details about her parents, growing up in the family's home in Omaha, Nebraska, and what drove her father to give away a large chunk of his fortune to charitable causes. As for finding out that her father was rich from a news article, sh