It's been a heartbreaking rollercoaster for the Brown and Houston families, who've had to watch 21-year-old Bobbi Kristina Brown fight for her life in a medically induced coma after being found unconscious in a bathtub on Jan. 31.

Now, her father Bobby Brown is being faced with a devastating decision. How much longer does he keep his daughter on life support?

A family source confirms they are still holding onto hope and praying for a miracle — but if Bobbi Kristina doesn't wake up by the end of the week, they will discuss taking her off life support.

bobby brown

Bobby Brown with Bobbi Kristina in 1994. (Photo Credit: Getty Images)

Doctors have reportedly told the family there isn't much left to do for Whitney Houston's daughter, who's remained virtually lifeless for over two weeks, but that won't stop them from praying and keeping their hope alive.

"We continue to request privacy in this matter. We thank everyone that supports Bobbi Kristina and God is hearing our prayers,” Bobby Brown said in a statement.

'Radar' reported the news first.