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Sister Sledge is an American musical vocal group from Philadelphia, Pennsylvania. Formed in 1971, the group consisted of sisters Debbie, Joni, Kim and Kathy Sledge. Symbolizing strong family values, the siblings achieved international success at the height of the disco era. The year 1979 saw the release of their breakthrough album We Are Family, which peaked at number three on the US Album Chart and went Platinum. The album included the 1979 single "We Are Family" which reached number two on the US Billboard Hot 100 and earned them a Grammy Award nomination, together with two other 1979 top 20 international hits "He's the Greatest Dancer" and "Lost in Music".
Their other US hits include a 1982 remake of Mary Wells' 1964 hit, "My Guy", and other international hits include "Mama Never Told Me" (1973), "Thinking of You" (1984), before reaching number one on the UK Singles Chart with the song "Frankie" in 1985. Remixed versions of three of their singles in 1993 returned them to the UK Top 20. Following Kathy's departure in 1989, the group then operated as a trio (with Kathy occasionally re-joining for one-off performances and several releases in the 1990s) until Joni's death in 2017. In 2015, Sister Sledge performed for Pope Francis at the World Festival of Families in Philadelphia.