I'm pretty sure that everyone has heard this by now but Die Welt (English) has a couple of great pictures of Mrs. Dunham at "Obama leaving campaign to visit ill grandma". One shows her back on her porch in Kansas when Sidney Ann was young and the other with high school graduate Barry (as they called him).
The gist:
Senator Obama will be leaving the campaign trail to visit his grandmother, Madeline Payne Dunham, in Hawaii who is assumed to be close to death. The senator will leave after a campaign stop in Indiana Wednesday which replaces one in Madison Wisconsin and one in Des Moines, Iowa originally scheduled for Thursday. Michelle will fill in for him on Friday, and he is expected to resume the campaign on Saturday.