Kevin Federline describes ex-father-in-law Jamie Spears as ‘a flawed man’ in an interview with ET’s Kevin Frazier, ahead of the release of his tell-all memoir, ‘You Thought You Knew,’ out Oct. 21. He goes into Britney Spears’ conservatorship and how he believes it was mishandled by her father. Federline also reacts to Spears’ other ex-husband, Sam Asghari, labeling him a ‘professional father’ who leeched off of Britney’s money.