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With a huge grin on her face and giving a thumbs up to the camera, Bobbi Kristina Brown stands next to one of her best friends - who holds a huge hunting knife aloft. 

The 21-year-old, who remains in medically-induced coma after being found face down and unconscious in a bathtub at her Roswell, Georgia, home on January 31 more than a week ago, has a coterie of friends who have surrounded her ever since her mother's death. 

However, it's a gang who appear to have a life of fast cars, expensive watches - and guns and knives.