At the 2007 Grammy Awards , Stone shared the award for Best R&B Performance by a Duo or Group with Vocals for her collaboration with John Legend and Van Hunt on their 2005 cover of Sly & the Family Stone 's 1971 chart-topper `` Family Affair '' .
Stone won Best R&B Performance by a Duo or Group with Vocals for her cover of `` Family Affair '' with John Legend and Van Hunt .