Bobby Brown and Whitney Houston's only child is still fighting for her life after the near-drowning incident at the home she shared with Gordon, and her boyfriend is in rehab struggling with substance abuse issues, but his brother, Jack Walker, has broken the family's code of silence and admits he wasn't surprised when he heard Bobbi Kristina had been hospitalised and placed in a medically-induced coma.

He says, "I didn't like what was going on in that house. It was very, very bad... People don't understand the relationship between Nick and Krissy.

"She was fed up with everything that was going on in her life. She used drugs and alcohol to run away from her problems."

Walker tells news show Extra he was aware of the substance abuse and heavy drinking that was prevalent in the couple's home and he reached out to his brother in a bid to persuade him to slow down.

He adds, "I let Nick know... 'You need to stop doing that'."

Bobbi Kristina's family has dismissed reports suggesting the 22 year old was abusing drugs.

Meanwhile, as Gordon completes his rehab stint, Walker insists his brother is "clean", adding, "From the letters that he sent me I can tell you that he's excited that he's clean now."