Walden Media has optioned Peter Craig's family comedy spec script Relativity, according to Variety.

The story follows the Fergusons, who on the eve of their 35th wedding anniversary bring their children together to tell them a secret that sends shock waves throughout the household and sets off a series of humorous and moving events.

Craig developed a short film Nevel Is the Devil which made its debut at the 2006 South by Southwest Film Festival and has screened at U.S. festivals.