Kevin Federline accuses Britney Spears of verbally mistreating their sons, Sean Preston, 20, and Jayden James, 19, on multiple occasions in his explosive new memoir.

Federline makes several allegations against Spears in “You Thought You Knew,” including that the “Toxic” singer once punched Preston in the face.

He also writes that when Preston was about 10 or 11 years old, he asked Federline why Spears kept forcing him to bathe with her.

“It was clear he was uncomfortable, to put it mildly, and I had to step in and make it stop,” Federline writes.

The former backup dancer describes in detail multiple alleged incidents of alarming behavior from Spears toward their sons, including repeatedly feeding them shellfish despite them being allergic to it, and ignoring, in general, that Jayd

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