Sources connected with the Brown family tell TMZ ... they are a united front to this extent -- they refuse to be disrespected the way they feel they were at Whitney's funeral.
You may recall ... Bobby Brown stormed out of the funeral after security refused to let him sit with Bobbi Kristina during the service. Bobby told us at the time ... he was also furious the Houstons were angry that he dared to bring 9 members of his family with him.
We're told the feud has already reignited. Houston family security set up a perimeter around Bobbi Kristina's room shortly after she was taken to the hospital and there was a passcode to gain entrance. Many people in the Brown family were not given the code and it caused an uproar.
As one Brown family member told us, "If something happens to Bobbi Kristina, we will not be treated like children."
And we're told the angry discussions are not being held around Bobby Brown. He's gotten wind of the talks several times and he immediately shuts everyone down.