...But Bobbi Kristina was more than just close to her mother; she became her caretaker as the six-time Grammy winner struggled with addiction.
"Bobbi Kristina basically grew up her mother's caretaker, similar to Frances Bean," Drew said, comparing her to the daughter of singers Courtney Love and Kurt Cobain.
"In a way she was the adult in relationship," Drew said.
Brown also battled addiction and together, he and Houston, "enabled" one another, Drew said.
"People don't know that while Bobby was a stone cold alcoholic, he didn't ruin Whitney," a former associate of Houston's told ABCNews.com.
In a 2009 interview with Oprah Winfrey, Houston called Brown "her drug," adding that she "didn't do anything without him."
She also shed light on their actual substance abuse issues: Marijuana laced with cocaine was their substance of choice, and they "would have ounces" of cocaine available at all times...