Britney Spears was photographed handing her mother Lynne a set of papers on Thursday believed to be a move to keep Lynne away from grandsons Sean Preston and Jayden James if she is taking any medications that might cause her to be impaired.

According to TMZ, the letter was from out-of-state lawyer but is not a restraining order. “She did not serve me,” Lynne told X17 photo agency of Brit’s letter. Britney had tracked down her mom on the set of her sister Jamie Lynn’s show Zoey 101 with help from the paparazzi.

As The ENQUIRER has reported, sources say the bad blood began when Lynne, Britney’s ex-husband Kevin Federline and other family members convinced Britney to go into rehab at Promises in Malibu. With Lynne’s encouragement, Kevin told Britney they’d reconcile when she completed rehab, even though he had no intention of doing so. Britney found out — and hasn’t spoken to her mother since, sources say.