She was 86.
"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."
"She's the one who put off buying a new car or a new dress for herself so that I could have a better life," he said in his acceptance speech at the Democratic National Convention. "She poured everything she had into me. And although she can no longer travel, I know that she's watching tonight, and that tonight is her night as well."
source - cnn.com