Summer and Joseph McStay seemed to be living the suburban American dream in early 2010, raising two young boys in the heart of Southern California. Then, the entire family disappeared without any explanation or goodbyes. For years, investigators puzzled over how the couple and their children could vanish entirely. A new "20/20" episode, "What Happened to the McStays?" airing Friday, Oct. 3, at 9 p.m. ET on ABC and streaming the next day on Hulu. You can also get more behind-the-scenes of each week's episode by listening to "20/20: The After Show" weekly series right on your 20/20 podcast feed on Mondays, hosted by "20/20" co-anchor Deborah Roberts. With 4-year-old Gianni and 3-year-old Joseph Jr., the couple lived in a small apartment by the coast in San Clemente, California, where they wo

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