Bobbi Kristina Reportedly Brain Dead on a Ventilator: Family Preparing for the Worst, #PrayersForBobbiKristina Continue [DETAILS]

MStars News has been keeping fans of the Houstons and Browns updated with the condition of Bobbi Kristina, as Bobby Brown and Kristina's other family members try to keep the late singer Whitney Houston's daughter alive. MStars News previously learned that Kristina was found by her husband, Nick Gordon, and a friend unresponsive in her Roswell, Georgia, home bathtub over the weekend, and now the 21-year-old is fighting for her life on a ventilator in a local hospital. She is reportedly brain dead, and the family is preparing for the worst, so #PrayersForBobbiKristina continue.

Kristina's father, Bobby Brown arrived with actor and producer Tyler Perry to be by his only daughter with Whitney Houston bedside.

We previously learned that Gordon was banned from seeing his wife, as Pat Houston, Kristina's aunt, filed a restraining order, since Kristina remains in a medically induced coma.

Now it seems Brown may have to make a devastating decision if Kristina's brain activity doesn't improve.

According to Entertainment Tonight, Brown and the rest of Kristina's family have been advised to prepare for the worst.

"Krissy's on life support and it does not look good," a source revealed to Hollywood Life. "It looks as though her father Bobby might have to make the most difficult decision a father could make -- whether to take her off life support."

Last time we checked in, doctors tried to keep positive outlook on Kristina's outcome, but said it would be a miracle if she recovers fully.

Now it seems that hope is lost.

"The mood in the hospital is very tense," the source said about the family. "There was a moment of hope on Saturday night[, Jan. 31,] when doctors saw brain waves, but they have since decreased. It's so sad."

ET claims Kristina's incident was caused by an apparent drug overdose.

Hollywood Life claimed that her cousin, YF Kennedy, said drugs were not a factor.

"Krissi doesn't do drugs," he said to E! News. "She hasn't been drinking or doing drugs and she's cut down on cigarettes. She's been trying to get her music together and keep her voice clean. Her voice is so beautiful."

Kristina's incident is not "an attempted suicide," according to the ET reporter in the video below, "but is being investigated by police as an apparent drug overdose. "

Whitney Houston died almost three years ago Feb. 11, 2012, when she drowned in a Beverly Hills hotel after using cocaine and having coronary heart disease.