Joni Sledge, who recorded the infectious dance anthem “We Are Family” with her three sisters, was found dead in her Phoenix home, the band’s rep said Saturday. The 60-year-old member of Sister Sledge had not been ill, and her cause of death remains unclear, said the band’s publicist Biff Warren. A friend found Sledge on Friday. “On yesterday, numbness fell upon our family. We welcome your prayers as we weep the loss of our sister, mother, aunt, niece and cousin,” read a family statement.