Cissy Houston, the Grammy-award-winning gospel artist and the late mother of music icon Whitney Houston, has passed away at 91. Cissy's daughter-in-law, Pat Houston, confirmed to USA Today that Cissy died at her home while under hospice care after suffering from Alzheimer's. Cissy's contributions to gospel music left an indelible mark on the genre. Pat released the following statement: "Our hearts are filled with pain and sadness. We lost the matriarch of our family." Pat co