In a newly filed petition seeking to remove Britney Spears father as one of her conservators, the pop stars mother accused him of having an appalling and inexcusable physical altercation with the singers two sons.

In the petition filed Monday by Spears new attorney Mathew Rosengart, her mother, Lynne Spears, included a statement saying the relationship between her daughter and her father, James Jamie Spears, has dwindled to nothing but fear and hatred on her daughters part.

The incident between Jamie Spears and his grandsons, who are 15 and 14 years old, was the final straw, the stars mother said.

Lynne Spears also describes in her Declaration a physical altercation between Mr. Spears and the conservatees minor children as appalling and inexcusable [which] understandably destroyed whatever was left of a relationship between them, the petition states.

Jamie Spears is not fit to be his daughters conservator, Lynne Spears concluded in her statement.

It is clear to me that James P. Spears is incapable of putting my daughters interests ahead of his own on both a professional and a personal level and that his being and remaining a conservator of my daughters estate is not in the best interests of my daughter, the conservatee, she said.

The petition that Rosengart, the first legal counsel Spears had permission to select on her own in her conservatorship case, filed in Los Angeles Superior Court this week seeks to replace her father in the conservatorship with Jason Rubin, a professional fiduciary and forensic accountant with significant experience as a conservator.

Judge Brenda Penny, who is overseeing Spears conservatorship case, will consider the petitions at a Dec. 13 hearing.

Rosengart noted in the petition that this petition is only an initial narrow step and that there might well come a time when he seeks to terminate the entire conservatorship and pursue charges against Jamie Spears.