At War Over Bobbi Kristina! Cissy Houston Vows To Fight Bobby Brown 'To The Grave' To Protect Whitney's Millions

After the bombshell news that Bobby Brown is making a move to gain control of Bobbi Kristina's financial estate, RadarOnline.com has learned that her grandmother, Cissy Houston, is seething over his attempt to take over Whitney's millions, and has vowed to "fight this to the grave."

Bobby filed paperwork with a Georgia court last week, hoping to gain control of his ailing daughter Bobbi Kristina Brown's estate, according to the Atlanta Journal Constitution.

However, Whitney's mother has vowed to protect her granddaughter's estate at all costs.

"Cissy Houston will fight this to the grave," a source close to the family told RadarOnline.com.

And although the 81-year-old made a public statement via her lawyer insisting that this was a family matter, the source told RadarOnline.com that behind the scenes, there's incredible tension between the Houstons and the Browns.

"Since day one, all of the Houstons have been waiting for Bobby to try and get Bobbi Kristina's money and they knew it was just a matter of time. No one is surprised that he is making a grab for her money," the source said.

Stay with RadarOnline.com for developments to the story.