The Insider.com

Whitney Houston's ex-husband has infamously taken the brunt of the blame for the singer's unfortunate downward spiral, but in a revealing new interview with Whitney's friends and family, her sister-in-law Patricia Houston alleges that the late artist's problems with substance abuse did not originate with Bobby Brown. 

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"I can't say that he introduced drugs to her. I don't think that's true," she defends to Oprah Winfrey of Brown, explaining she had "a good relationship" with Bobby, and could never see Whitney as a victim of Brown's vices. "I can't go along with that [misconception]," says Patricia.

Patricia Houston: Whitney was Chasing a Dream

Watch the clip for a preview of Houston's new interview. The special episode of Oprah's Next Chapter airs this Sunday on OWN.