No, Vince McMahon and Jim McMahon are not brothers. Vince McMahon is the chairman and CEO of WWE, while Jim McMahon is a former NFL quarterback who played for teams like the Chicago Bears and the Green Bay Packers.
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Jim McMahon and his wife Nancy were married from May 1, 1982
until their divorce in 2009. Jim McMahon is a retired quarterback
in the NFL.
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Jim McMahon played for the Pack in 1995-1996, just before he
retired.