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Owen Wilson and Ed Helms star as fraternal twins Kyle and Peter who accidentally discover they've been living with a lie all their lives. The kindly man in the photo on their mantle isn't their father after all, but an invention their mother (Glenn Close) concocted to conceal the truth: that she actually doesn't know who their real father is. See, it was the seventies, and things were crazy, and...well, you know.
the official version from warnerbros.com on December 20, 2017
Ed Helms and Owen Wilson play Peter and Kyle Reynolds, two brothers whose eccentric mother (Glenn Close) raised them to believe their father had died when they were young. When they discover this to be a lie, they set out to find their real father, learning more about their mother than they probably ever wanted to know.
the official version from warnerbros.com on September 15, 2016
Fraternal twin brothers find out that their mother's been lying to them for years about their allegedly deceased father. She confesses she slept around with politicians, athletes and movie stars she met at Studio 54 in the 1970s, one of whom may be their father. The twins set out to find their real dad.
verbatim from hollywoodreporter.com on June 18, 2011