Frank Lambert is a main character on ABC family comedy Step by Step. He is portrayed by Patrick Duffy.
Prior to the series' debut, Frank had been a construction worker who had been married for many years, and his marriage produced three children, JT, Brendan and Al. Eventually Frank struck out on his own and started his own contracting company. Frank seemed to have a stable, rewarding life, and worked hard to provide for his family. However, one day out of the blue, his wife felt life had passed her by and told Frank she was leaving him to pursue a job as a lounge singer in Nevada, also leaving him with the children. Frank took this hard until he starting dating a widow named Carol Foster, who had three kids of her own. Eventually he proposed marriage to Carol, and Frank is working to rebuild his life and serve as the patriarch of his new blended family. Frank followed Carol to Jamaica were they got married. They weren't dating, prior.