Whitney Houston's daughter Bobbi Kristina Brown 'still on life support'

Whitney Houston's daughter Bobbi Kristina Brown has not been taken off life support, a family source told Reuters.

The 21-year-old was rushed to hospital after being found unconscious in her bathtub at her home in Atlanta last weekend.

The source, who asked not to be identified, said media reports that she had no brain activity were incorrect.

Bobbi Kristina's cousin Jerod Brown said doctors were not optimistic about the aspiring singer's chances.

"Though it seems the odds are against her, though doctors don't see any hope for change ... though it looks impossible for her to stand again STILL PRAY FOR BK," he wrote on Instagram, where he posts as yfkennedy.

Earlier this week her family said she was "fighting for her life" after being rushed to hospital

Houston, a six-time Grammy Award winner and actress, drowned in a hotel bathtub in Beverly Hills, California, on Feb. 11, 2012. Authorities said cocaine use and heart disease contributed to her death at age 48.

Roswell police and an attorney for Bobby Brown said they were investigating the circumstances that led to Bobbi Kristina Brown's hospitalisation.

In a video interview with E! News earlier this week, Jerod Brown asked people to "let the detectives do their jobs" and to stop speculating about what had happened to his cousin.