Francis "Frank" Atwood was the father of Ryan Atwood and Trey Atwood. He was married to Dawn Atwood, although since Dawn has dated other men, they appear to be either divorced or seperated. He was charged with armed robbery and has been serving a prison sentence for the entirety of the show. He also appears frequently in season 4 and ends up having a son with Julie Cooper Nichol, Their son, Cooper Atwood was born a few months after Kirsten and Sandy's daughter.