Whitney Houston's family is about to step into the spotlight with a reality show that already has a twist: The late singer's 19-year-old daughter Bobbi Kristina is engaged to her "adopted brother."

A new Lifetime series "The Houstons: On Our Own" is set to debut in two weeks, but a sneak peek promo confirms what the tabloids have been buzzing about for months. Bobbi Kristina Brown, the only daughter of Houston and the fourth child of New Edition singer Bobby Brown, is engaged to marry Nick Gordon.

Bobbi Kristina previously denied the claims, though she had been photographed several times with an engagement ring and looking cozy with the 22-year-old Gordon, who was reportedly adopted by Houston 10 years ago. The pair often posted pictures together on Twitter while continue to say the ring was just a gift.

However, a video clip shows the couple revealing their engagement to the family. Most of their relatives disapprove, including Whitney's sister-in-law Aunt Patricia, who calls it "unacceptable."

The late "It's Not Right (But It's Okay)" singer's brother Michael Houston told ABC in March that Gordon was "like a son to her," but wouldn't clarify if he was officially adopted.

Gordon, however, explained on Twitter when dating rumors first appeared that he and Bobbi Kristina, whom he calls "Kriss," are not related by blood. "For the stupid ppl out there, she gave birth to 1 child," he tweeted earlier this year. "She called me her 'God Son.' I swear some ppl in this world act like they don't have a brain."

The engaged couple have since made their social media accounts private.

Whitney Houston died February 11 at age 48 in a Beverly Hills hotel. The Grammy-winning singer's last project was co-starring in the movie "Sparkle" with Jordin Sparks -- the DVD hits stores on Nov. 30.

Her family's reality show, "The Houstons: On Our Own," premieres Wednesday, Oct. 24 at 9 p.m. on Lifetime.

Get More: Music News