Washington, July 30 : Britney Spears' ex-husband Kevin Federline is reportedly shocked that the singer didn't make much effort to win custody of their two young sons.
Federline gained sole custody of Sean Preston, two, and Jayden James, one, earlier this month (Jul08), following a bitter 18-month court battle.
Getting the sole custody means that he now has to manage being a full-time parent to his sons and looking after his two kids from a previous marriage.
Federline is said to be adamant that Spears' should take an active role in bringing up the boys.
"Kevin loves his sons, but he didn't aim for sole custody. He wanted to be a co-parent and didn't expect Britney not to fight for custody," Contactmusic quoted a source, as telling British magazine Closer.
"He never wanted full responsibility. He believes both parents should take an active role. It's tough being a single parent, plus he already has another two children," the source added.