Spears' ex -- who has three other children with two different women -- said Sean Preston, 6, and Jayden James, 5, need a sense of stability.
"Sean and Jayden have missed out on so much of that with me and their mom being so busy all the time," Federline told The Herald Sun. "Now we've both agreed that this is it, they are going to be at school and learn what it's like to be part of society as normal kids."
Federline is father to Kori, 9, and Kaleb, 7, with ex-girlfriend Shar Jackson; he welcomed daughter Jordan Kay with former volleyball player Victoria Prince on August 15, 2011. Spears, 30, is currently engaged to former agent Jason Trawick.