Britney Spears' father, Jamie Spears, is currently under police investigation after the child's father, Kevin Federline, alleged that he abused their 13-year-old son.

Law enforcement sources told The Blast, that the father of her boys, Kevin Federline, walked into a sheriff's station last Sunday, August 25, and filed a police report against Jamie, alleging battery on his minor son.

"Mr.Federline alleged the grandfather battered one of the star's sons on Aug.24, I believe the 13-year old," Sgt.Bugarin spokeswoman for the Ventura County Sheriff's Office said to Radar Online.

"Britney had the boys at Jamie's condo on the evening of August 24. Jamie and Sean Preston got into an argument. Sean Preston felt unsafe and locked himself into a room. Jamie broke into the room and shook Sean Preston," an insider told Us Magazine.

"Jamie has a temper, which is no secret to anyone in the family," another informant told Us. "Fortunately, Britney did the right thing and took her boys to safety and away from her father. The whole incident was very upsetting to her and her boys. Kevin was and still is furious." 

According to the source, Preston was not hurt physically injured but that he was "shaken up."