Kellie Pickler will sing Wednesday afternoon (May 7) on the west lawn of the U.S. Capitol in Washington, D.C., as part of the AARP GrandRally, an event targeting grandfamilies -- grandparents raising their grandchildren. Pickler was 2 years old when her parents separated and her mother left. Her father has been in and out of prison on a variety of charges, and Pickler was raised by her grandparents, Faye and Clyde Pickler Sr. At the rally, Pickler will perform "My Angel," a song she wrote about her late grandmother. As her charity of choice, Kellie has donated almost $50,000 to the AARP's Grandparenting Foundation, which addresses the financial, legal and medical challenges faced by grandparents. "Having been raised by my grandparents, I know the struggles they face raising their grandchildren," Pickler said.