Obama’s Mama was being rebellious, on purpose.
The grandparents did as best they could, and nobody reports that Barack was a misbehaved boy. His liberal angst came later, when he went to university (the Bill Ayers ghostwritten version reads it back into his secondary school youth).
If my post sounded like I was in any way blaming the grand parents, that wasn't my intent. If it was offensive, I apologize. I was reciting the history of 0bama's childhood as I've heard it.