"My dad died when Rob was 16. Rob doesn't have a father figure in his life," she explains. "When [our stepdad] Bruce [now Caitlyn Jenner] was around, he was great, but he was going through his own things that none of us understood at the time. Lamar
was [Rob's father figure]. Once Lamar left -- and it's not Lamar's fault at all -- I think Rob didn't know where to go. He was like, 'I don't have guidance anymore.'"