Britney Spears' lawyer responded to Kevin Federline's post sharing videos of Spears and her sons.
Mathew Rosengart said it was "cruel" to share the old videos, taken by the children, on Instagram.
He urged Federline to accept Spears' wishes to keep their disagreement a private matter.
Britney Spears' lawyer has slammed Kevin Federline for sharing multiple "cruel" videos that appear to show the singer arguing with her two sons.
Spears and her ex-husband are currently in a feud after Federline spoke out about the pop star's relationship with her sons, Sean Preston, 16, and Jayden, 15. Last week, he told the Daily Mail that the boys "have decided they are not seeing her right now."
After Spears said in a now-deleted Instagram post that it was a "pretty harsh decision," Federline shared videos on his own Instagram page that appear to show heated conversations between Spears and her sons "when they were 11 & 12."
"I can not sit back and let my sons be accused in this way after what they've been through," Federline captioned the post, which was eventually deleted on Thursday. "This isn't even the worst of it. The lies have to stop. I hope our kids grow up to be better than this."
Spears' lawyer, Mathew Rosengart, told People in a statement that the "Circus" singer would like to keep the issues with her sons "private."
"Britney has faithfully supported her children and she loves them dearly," the statement began. "Whether he realizes it or not, Mr. Federline has not only violated the privacy and dignity of the mother of his children, he has undermined his own children, whose privacy he should protect."
Rosengart continued: "Putting aside his ITV interview, Mr. Federline's ill-advised decision to post an old video of his 11 and 12-year-old children was cruel, bottom-of-the-barrel stuff. It was abhorrent. In addition to demeaning himself and violating societal norms, he has now also created various legal issues for himself including, but not limited to, implicating cyber-harassment and cyber-bullying statutes, among other things."
The lawyer added that he is working with Instagram to ensure Federline follows the rules of the platform and is "exploring all appropriate relief against him."
Rosengart added: "In the meantime, as Britney herself poignantly said, whatever is occurring between her and her boys should remain private. We urge Mr. Federline to act with a measure of grace and decency and to cease from publicly discussing private matters, which benefits no one."
Since Federline's interview, Spears and her new husband, Sam Asghari, have hit back on Instagram, saying her relationship with her children should be a private matter.
Representatives of Federline did not immediately respond to Insider's requests for comment.
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