The Chapin Sisters recently released their debut album, but the three siblings -- all nieces of late singer/songwriter Harry Chapin (of "Cat's in the Cradle" fame) -- have been singing separately and together since they were kids: Jessica, 40, cut class to record commercial jingles, while Abigail, 28, and Lily, 26, pulled children's choir duty on records by the Olsen twins, among others.