There you go quoting Dreams again! I wish you would cut that out! That is dialog and situation framing created by Ayers/Obama that you are quoting. Nothing about it can be trusted.
Yes, dialogue and situation framing it is, therefor making 'granny' Sarah out to be jealous is nothing but a cover-up for something that the entire CLAN knew about, and probably the next village and the next village too...it's the fact that she had no reason for jealousy that gives the lie away. She's mother to the eldest son, and the eldest son inherits the land.
That paragraph attempts to conceal something that was generally known - Kezia was not the mother of the kenyan's children. He left Kenya when he was 17 or 18.
She's no fool...