I think you have some particular motive at play other than as stated.
I think Ayers’ book is mostly fiction little bits of fact tossed in. I think that the Kenyan Obama’s marriage to Stanley Ann, whatever it may have been, was for convenience for each of them, and other than the papers - whatever way they might have arranged it - they had no relationship at all.
I agree with you 100% about the book being mostly fiction and the marriage too. They had less than no relationship.