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Four sisters: Kim Sledge (born 21 August 1957), Debbie Sledge (born 9 July 1954), Joni Sledge (born 13 September 1956), and Kathy Sledge (born 6 January 1959). Best known for their work with Chic in the late '70s, Sister Sledge reached the height of their popularity during the disco era but had been recording since the early '70s and were still active in the late '90s. The group was formed in Philadelphia in 1971, when the sisters' ages ranged from 12 to 16, and they recorded their first single,