VIDEO : Kevin Federline Wants More Child Support From Britney Spears

Since he has custody of their sons Sean Preston, 12, and Jayden James, 11, the rapper, 39, is requesting an increase to his monthly $20,000 in child support ?to recognize the sacrifices he?s made,? reveals a source. Spears, who raked in more than $137 million during her Las Vegas residency, doesn?t buy his reasoning. ?She?s angry Kevin is asking for more money because she pays for everything,? says the insider, noting the divorced duo have a ?strained? relationship.