Kevin Federline Reveals Horrific Details About Britney Spears' Relationship With Her Sons

In an excerpt published by the New York Times, Kevin Federline describes a horrifying incident — one that, he says, made his then-teenage sons not want to stay with their mom, Britney Spears. Britney allegedly stood over them with a knife as they slept. When they woke up . . . she simply turned and walked away.