Oprah and Bobbi Kristina Brown

Whitney Houston's daughter Bobbi Kristina says her late mom is always with her.

"I can hear her voice in spirit talking to me. I can always feel her with me," Bobbi Kristina, 19, told Oprah in an interview that aired on OWN Sunday night.

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In her first interview since Houston's death exactly one month ago, Bobbi Kristina said the grief comes and goes, but that she finds comfort in living at her mother's home outside of Atlanta, Ga. "I still walk in the house ... and call her name. The lights [will] turn off and on and I'm like, 'Mom what are you doing?'"

In addition to Bobbi Kristina, Oprah sat down with Houston's sister-in-law and manager Patricia, who was down the hall from Houston's hotel room when the singing legend was found dead last month. "[Her assistant Mary and I] were gone no more than 30, 35 minutes. When we returned ... I headed down the hallway to [Whitney's] room and I heard screams," Patricia told Oprah. "When I got into the room I saw my brother Ray trying to revive her to the point of exhaustion. I said Ray, 'Let it go.' She had a peacefulness on her face. I saw [paramedics] cover her up and I knew that was it."

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Many rumors about the cause of Houston's death immediately surfaced, including speculation about a drug overdose and an accidental drowning. Houston was in the bathtub when her assistant found her.  Asked about the possibility of drug use, Patricia said, "I don't know what happened that day, but when you are recording and you have a meeting with Clive [Davis] and you have fittings and you have to see your throat doctor, are you high? Absolutely not."

Towards the end of the interview, Houston's brother and Patricia's husband Gary joined. He said despite her history with drug abuse, he never imagined his sister would die so soon. "I never thought anything like this would happen," he said. Patricia, however, wasn't shocked. "The handwriting was on the wall," she said. "I'd be kidding myself to say otherwise."

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Mentions of Houston's ex-husband Bobby Brown were kept to a minimum. "I loved Bobby," Gary simply said. "I don't know how good they were for one another as time went on."

Gary and Patricia say they have found closure. "It is well with my soul," Gary said before Patricia added, "I will miss her but I know she's with me."

Said Bobbi Kristina: "Everyone wanted to say that she was something that she wasn't ... but they don't know who she really was. I want people to know that all that negativity is garbage. That's not my mother. I know who she was, her family knows who she was. I just saw her as mom."

Watch a clip from the interview below:

First Look: Patricia Houston on Whitney Houston's Death

On Sunday, March 11, Oprah sits down with Whitney Houston's daughter, Bobbi Kristina; her sister-in-law, Patricia Houston; and her brother, Gary Houston, in a special episode of Oprah's Next Chapter airing at 9/8c, only on OWN. In this sneak preview, Patricia reveals whether she thought drugs would someday claim Whitney's life and why she was concerned about her lifestyle.