Relative Strangers (2007)

Synopsis
A successful psychologist with a picture-perfect family and a best-selling self-help book that's fast racking up sales hires a dogged detective to investigate his brother's claim that he was actually adopted, only to watch as his life falls to pieces in the aftermath in a dark comedy about success and family starring Danny DeVito, Kathy Bates, Ron Livingston, and Neve Campbell. Dr. Richard Clayton (Livingston) has everything a man could ever want in life: a loving fiancée (Campbell), two loving parents who are always there to support him (Edward Hermann and Christine Baranski), and a career that's on the fast track to success. When Richard's embittered brother (Bob Odenkirk) resentfully tells his sibling that he was adopted, however, the once-thriving specialist embarks on a tireless quest to locate his true birth parents. Though his dreams of finding his biological mother and father fade into a nightmare when a private investigator reveals to Richard that he was in fact conceived by crude carnies Frank and Agnes Manure (DeVito and Bates) -- who subsequently make it their mission in life to make Richard miserable -- the desperate doctor soon finds that even if he can't stand his real parents, he has learned a valuable life lesson from them. ~ Jason Buchanan, All Movie Guide