Kevin Federline reflects on his past marriage to Britney Spears in his upcoming memoir, You Thought You Knew, and makes some wild claims about his ex.

An excerpt from the book published via The New York Times on Tuesday, October 14, alleges that Federline, 47, and Spears’ two sons — Sean Preston, now 20, and Jayden James, now 19 — were afraid of staying at their mom’s house.

“They would awaken sometimes at night to find her standing silently in the doorway, watching them sleep — ‘Oh, you’re awake?’ — with a knife in her hand,” Federline writes. “Then she’d turn around and pad off without explanation.”

Federline and Spears, 43, were married from 2004 to 2007. He recalled one evening in 2008 when Spears was placed under an involuntary psychiatric hold following a standoff that involved th

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