Mrs Dunham, who had cancer, helped bring him up. He called her "Toots" and she called him "Barry". In a statement with his sister, Maya Soetoro-Ng, who was with Mrs Dunham when she died, Mr Obama said: "She was the cornerstone of our family, and a woman of extraordinary accomplishment, strength, and humility. 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."