Bobby Brown stays by his daughter's side as Bobbi Kristina Brown clings on to her life.

Brown has remained by her daughter's bedside as he continues to keep his eyes on her round the clock since the 21-year-old was hospitalized after being found unconscious in her bathtub in her home in Atlanta.

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Brown "stands over her and touches her hair and calls her 'baby girl,' " a relative told People.

Brown has been singing her late ex-wife's hit, The Greatest Love of All, to her daughter. Close family members were also with him in the intensive care unit.

Bobbi Kristina has been rushed to a hospital in Roswell, Georgia, but was later on transferred to the Emory University Hospital.

"We'll sing 'Jesus Loves Me,' 'Amazing Grace,' but also some of Whitney's songs," the relative told People, saying that they have been singing her "'Greatest Love of All."

Bobbi has still remained unresponsive after being placed in medical induced coma and breathes only with the help of a ventilator.  Brown, who decides about her daughter's health care, still hopes that her daughter would make full recovery.

Brown and Bobbi Kristina have had a rather rocky father-daughter relationship, a source revealed in an interview with People following Whitney Houston's death in 2012.

The source went on saying that they both got into big fights and wouldn't talk for days.

"They will be talking and loving to each other, and then a little thing will turn into something big and they won't talk for a long time," the relative said.

Nevertheless, "deep down, they love each other very much," the relative continued. "It would kill Bobby to lose her. I mean literally kill him."

TagsBobbi Kristina Brown, Bobbi Kristina Brown in coma, Bobby Brown, Whitney Houston