Singer-songwriter Rufus Wainwright was on Martha Stewart's show today with his mother, singer Kate McGarrigle; sister, Martha Wainwright; Aunt, Anna McGarrigle; and her kids, Sylvan and Lily. The whole clan wore sweaters knitted by Rufus's mom, and she told a funny story about how she'd made Rufus a sweater and he'd lost it in a "disco in Paris." After Rufus and Kate showed Martha how to make ski cookies, the family serenaded Martha with a harmonious a cappella Christmas tune, which was quite lovely. (They messed up at first, which was really cute!) Clip above.

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