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The Walsh Brothers (Dave and Chris Walsh) — who are much-loved, Boston-bred sibling comedians who moved to Los Angeles a few years ago — performed a benefit at Great Scott on Friday night for the family of Martin Richard, the 8-year-old who was killed during the Boston Marathon bombings. The guys said on their Facebook page that they raised $1,600, all of which will go to the local family. The Walsh Brothers are now making videos for Comedy Central.