Bobby Brown has urged the public to "disregard" anything his relative Jerod Brown utters regarding his daughter Bobbi Kristina's health.
He says he's not authorised to speak on behalf of the family.
Jerod Brown has been quoted by media outlets over his cousin Bobbi Kristina's condition in recent days, but her father has urged those gathered outside Atlanta's Emory University Hospital to ignore what he has to say.
In a statement the R&B star said: "At this time it is requested that the media cease speaking with unauthorised members of the family.
"The integrity of the events that led to the hospitalisation of Bobbi Kristina must remain uncompromised. Various members of the family have provided media interviews, however, none of them are approved visitors to see Bobbi Kristina. None of them have firsthand knowledge of Bobbi Kristina's treatment and the medical staff at Emory University Hospital has not communicated with them."