Who is Obama Sr? We do not know that answer as no birth certificate has been shown.
“Who is Obama Sr?”
Do you mean “Who is Barry’s father”? I am confident that Barry’s father is Frank Marshall Davis.
“We do not know that answer as no birth certificate has been shown.”
I’m sure the birth certificate has long been incinerated and its ashes thrown into the Pacific along with the ashes of Stan & Ann Dunham.