I don't think that Obama actually lived, for an extended period, in Kenya. I understand, from the article below, that he visited three times. Here is a picture of his step grandmother's home. In my opinion, although it is certainly better than the accommodations enjoyed by brother George, it hardly represents a mansion and there is even mention that it has no running water of electricity.
http://www.nytimes.com/2008/02/24/opinion/24kristof.html?_r=1