In the accompanying photo, that’s Cher at left, either yawning widely or reaching for a very early high note. Holding the former Cherilyn Sarkisian is her mother, Georgia Holt, the subject of this often touching, perhaps even surprisingly entertaining Mother’s Day special. Cher, her 86-year-old mom, and Cher’s younger sister, Georgeanne, all swap stories and share photos and old movies in this one-hour special. Its goal is to push mom’s new record album, but the story of