I recall reading that too - about vaccine records issued WITH the birth certificate. AND, I would think BOTH would’ve been required to show when he entered America with his mother (assuming he was born in Kenya, which I personally believe to be true). That would logically fit with why they were BOTH together...
Just off hand, as I can’t recall myself, did Dreams come out before or after his mother’s death? I don’t think he found these things as a child, but rather upon her death as he went through her belongings... Many adopted children discover their “secret” the same way.
Stanley Ann Dunham died November 7, 1995. Publishing date for “Dreams from My Father” published 1995. I Don’t know the exact date month and day.