Kevin Federline's memoir, You Thought You Knew, out Tuesday, recounts his difficult years with Britney Spears and why he's speaking now that their sons are adults. In an AP interview from Hawaii, Federline, 47, says he wants Preston, 20, and Jayden, 19, to know his version of events. The book details salacious anecdotes and alarming claims about Spears' behavior; she denies them on social media, calling his account "gaslighting" and "white lies." Federline reflects on fame, parenthood, the conservatorship he deems necessary, and hopes Spears finds peace.

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