Alexandra Caroline "Lexie" Grey (born 1984) was the daughter of Thatcher (Jeff Perry) and Susan Grey (Mare Winningham), and the elder sister of Molly Grey-Thompson (Mandy Siegfried). Throughout her childhood, Lexie remained unaware that she also had an older half-sister, Meredith Grey (Ellen Pompeo), born to Thatcher and his first wife Ellis (Kate Burton), a world-famous general surgeon. Lexie was extremely intelligent as a child, having skipped third grade and "aced" her psych clerkship. When she turned 7, her parents threw her a surprise party that she always remembered as one of her best birthdays. She was very popular and had a great group of friends in her high school years, during which she was crowned prom queen and class valedictorian.