It doesn’t matter what the divorce papers say. They can put anything they want in there. This family was a bunch of liars.
There was no lawful marriage on that date. There may have been a marriage but it wasn’t a lawful one. Obama certainly knew he was already legally married. Ann may not have known.
I am just going by what the divorce papers say.
It gives Obama another connection to Cambridge, MA since his father was residing there at the time of the divorce. I would think attending Harvard as stated in the past. I do wonder if they say he hardly saw his father; if he really did see him while he was in Cambridge at that time or any other time in Cambridge.