The daughter of Bobby Brown and the late Whitney Houston was in a medically-induced coma for nearly five months after being discovered unconscious and unresponsive in her bathtub in nearby Roswell on Jan. 31.
"Tyler has been really close to the family," Winfrey said. "Tyler was really supportive of Whitney when she had her troubles -- he intervened and tried to help her -- and I know that he's been instrumental in trying to help Bobbi Kristina, too."
Since being moved to Peachtree Christian Hospice on Wednesday, a steady stream of family have also visited, including both Pat Houston and Bobby Brown's sister, Tina. The two aunts to Bobbi Kristina are not believed to have visited together before.