Khloe Kardashian revealed that her only brother, Rob Kardashian, started to feel "lost" after the death of their father, Robert Kardashian Sr., during an interview on "Watch What Happens Live!" on Sunday. The "Keeping Up With The Kardashians" star explained that her younger sibling was not able to move on since their father's 2003 passing until six years later.

"I don't think he blames any of us [for his problems], we talk about stuff all the time," the "Kocktails With Khloe" star told host Andy Cohen. "I think Rob hit a dark place more so dealing with my dad's death that happened later in life."

Khloe revealed that Robert always wanted Rob to attend college and he did just that. The future Arthur George sock maker graduated from University of Southern California in 2009.

"He kind of had no direction, and I feel like he felt lost there, and I think that's when he started dealing with my father's passing," the 31-year-old "Strong Looks Better Naked" explained of Rob, who has gained 100 pounds over the past three years. "And then breakups and all this stuff happened, which I think added to other things in his life, but it's issues he had to deal with from the start that he just didn't."

Aside from dealing with his father's death, Rob also dealt with nasty breakup from Adrienne Bailon who claimed that the son of Kris cheated during their relationship. "To this day, people will still say, 'You ruined Rob's life!'" she later revealed to Latina magazine. "And I'll think, Damn, I was still playing with Barbie dolls when I met him."

To recall, Rob was hospitalized few weeks ago and was diagnosed having type 2 diabetes which resulted in Rob's extended hiatus. However, as per the Kardashian-Jenner clan, the only boy in the family will make a major comeback soon.