(reuters)

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Cissy Houston mother has shared with People magazine that she questions her skills as a parent and wonders if she could have saved her superstar daughter from the drug use that played a role in her death.

"Was I a good mother?" Cissy Houston, 79, was quoted as telling the magazine in an advance excerpt released on Wednesday.

"I still wonder if I could have saved her somehow. But there's no book written on how to be a parent. You do the best you can."

Whitney Houston drowned accidentally in a Beverly Hills hotel bathtub on February 11, 2012, after a long-fought battle with drug addiction. She was 48.

Cissy opened up to People about her daughter's personal life and career while promoting her upcoming memoir, "Remembering Whitney."

She also told the magazine she was "worried" about granddaughter Bobbi Kristina and "trying to make sure she doesn't (follow the same path)" as her famous mother.

Cissy Houston's interview with People, and excerpts from her memoir, can be found in the issue which arrives on newsstands January 25.

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