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It's Christmas and Leonard's mother, Dr. Beverly Hofstadter (Christine Baranski) visits a horrified Leonard and a delighted Sheldon. Penny is upset because Leonard didn't tell her about his mother's visit nor his mother about their relationship. This problem gets secondary when Leonard learns that Sheldon has been in touch with his mother. Leonard is told about his parents' pending divorce, his mother's surgery, and the death of his dog all after...

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