A police car rolls up in front of your house--with your son in the back seat. A voice on the phone says your daughter is all right but won't tell you where she is--and then hangs up. A wallet disappears from your dresser and you're sure who took it--at least, somewhat sure. Many parents face problems beyond their ability to cope. John White ofers comfort to parents of children with severe problems--alcoholism, homosexuality, even suicide. Though...