Steve Granitz / 1 / 9
Steve Granitz / 1 / 9

It's a quiet Sunday outside of the hospital in Roswell, Ga., where Bobbi Kristina Brown's family is by her side as she lays in a medically induced coma.

A source close to the family tells ET that her father Bobby Brown, husband Nick Gordon and others have been advised to prepare for the worst and that the longer the 21-year-old remains in the coma, the more likely it will be that she will not regain consciousness. They are praying for her recovery but have also started to discuss how they would handle funeral arrangements.

NEWS: Source Says Bobbi Kristina's Bathtub Incident Is 'No Coincidence'

The daughter of the late Whitney Houston was found in a bathtub unconscious after an apparent drug overdose on Saturday morning, Jan. 31, at 10:25 a.m. Another source told ET that she was in "bad shape" when she was first found unconscious. She was taken to North Fulton Hospital and placed on a ventilator.

NEWS: Bobbi Kristina Brown Placed On Ventilator, Drug Overdose Suspected

Local police have a search warrant and have swept the house for drugs as they continue their ongoing investigation into what happened in Brown's home.

It has been almost three years since Houston died of accidental drowning on Feb. 11, 2012. The effects of heart disease and cocaine use also contributed to her death. Brown's incident comes two weeks after Lifetime aired the Angela Bassett-directed biopic, "Whitney."