I guess it's safe to say that these family relationships are on his mother's side of the family? Obama's father is a native of Kenya so I would think the common ancestors were on the American continent.
The AP gets their information from folks at ancestry.com. Genealogists study family trees and ancestors every day. In some respects, everyone is related if you go back far enough.
Hey...all families are dysfunctional. However, when you're sitting at Thanksgiving this year fighting with your family, think of how dysfunctional it would be for Rush Limbaugh, Dick Cheney, Bush, Obama, and Sarah Palin to be together in one place?