An investigation is underway in California after 13 siblings ages 2 to 29 were allegedly held captive in a home. 20/20 reports on the latest details coast-to-coast with those closest to the story.

Slender Man stabbing: Parents recall what happened that morning; 12-year-old survives being stabbed 19 times by her friends; What is Slender Man, the figure that motivated two girls to stab their friend.