Sister Sledge is an American musical group formed in 1972 and consisting of four sisters: Kim Sledge (born August 21, 1958), Debbie Sledge (born July 9, 1954), Joni Sledge (born September 13, 1957) and Kathy Sledge (born January 6, 1961). Their biggest successes Stateside came in 1979 with the popular disco anthems We Are Family (#1 R&B, #2 Pop in the USA) and He's the Greatest Dancer (#1 R&B, #9 Pop in the USA), produced by Nile Rodgers and Bernard Edwards of Chic.