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01/28/2013 01:21 pm ET Updated Jan 28, 2013

Whitney Houston's Brother, Michael Houston, On Doing Drugs With His Sister (VIDEO)

In her new book Remembering Whitney, Whitney Houston's mother, Cissy, writes about the shock, hurt and confusion she felt when she found out that Whitney and her brother Michael did drugs together. On "Oprah's Next Chapter," Oprah talks to Cissy and Michael about the drugs that ultimately cost Whitney her life.

"I feel responsible for what I let go so far," says Michael in this clip. "It just got out of hand."

Watch Oprah's interview with Cissy and Michael Houston on "Oprah's Next Chapter," Monday, January 28, at 10 p.m. ET.

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