Marlon Jackson breaks down in interview

Marlon Jackson just broke down in tears during an interview and walked off the set -- after explaining how his mother has been forcibly cut off from the rest of her family.

When asked about the current whereabouts of his mother, Marlon Jackson said recent explanations about her reported disappearance are "not good enough for me." 

"All I know is there's somebody who made the decision that my mother cannot talk to me, and whoever that person is, they've got to answer to me," Marlon told Kevin, without specifying individuals involved. "Because I'm going to see my mother and I'm going to bring her home."

Marlon -- along with brothers Tito and Jackie -- were sitting for an interview with "The Insider" when Marlon choked up.

Marlon explained, "We've been told that our mother is safe. She's doing well. But we have not spoken to her. We have not talked to her and I don't know where my mother is."

At that point, Marlon grew incensed, saying, "All i know is she is in Arizona, and whatever doctor is saying I can't talk to my mother you call ME!" Marlon then stormed off.

Randy Jackson -- one of the siblings who helped whisk away Katherine to Arizona -- has said Katherine was under doctor's orders to escape the constant frenzy of the Jackson home, and relax.

Clearly, Marlon didn't get the memo.