'House of Horrors' Adult Children Are Learning to Play Guitar, Including Tom Petty and John Denver

In the month since being rescued by California authorities from the "House of Horrors" they'd been living in, the seven adult Turpin siblings have made great strides in their ongoing recovery -- and some are even learning to play guitar, a hospital official tells PEOPLE. Mark Uffer, chief executive officer of Corona Regional Medical Center, where the seven adult Turpin siblings have been receiving treatment, tells PEOPLE, "They are doing well -- I think they are making progress." Uffer notes tha...