Obama's grandmother dies

(CNN) - Barack Obama's grandmother, Madelyn Dunham, has died following a bout with cancer, Obama and his sister, Maya Soetoro-Ng, said Monday.

"She was the cornerstone of our family, and a woman of extraordinary accomplishment, strength, and humility," their statement said. "She was the person who encouraged and allowed us to take chances. She was proud of her grandchildren and great-grandchildren and left this world with the knowledge that her impact on all of us was meaningful and enduring. Our debt to her is beyond measure."

Obama and Soetoro-Ng asked that donations be made for the search for a cure for cancer in lieu of flowers. A small private ceremony will be held "at a later date."