Warren Buffett's daughter-in-law couldn't think of a good Christmas present -- so she showed her company's finances to him

Paul Morigi/Getty Images for Fortune/Time Inc Warren Buffett's daughter-in-law couldn't think of a good Christmas present for him, so she showed him her company's finances. Mary Buffett was married to the famed investor's son Peter from 1980 to 1993, and the pair owned a music business together. "I didn't know what to get him, so I put together our music company's balance sheet to show him that we were making money," she told ThinkAdvisor. "I just wanted to show him, 'Look, we're doing good.'" V...