O Sr. being daddy is only hearsay without the b/c. The b/c is a legal document that the court will require for any suit against citizenship.
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Main Entry: hearsay evidence
Function: noun
Date: 1753
: evidence based not on a witness's personal knowledge but on another's statement not made under oath"
Obama's campaign web site put the (we know it as fake) COLB out there that stated his father was Sr. His book(s) have stated Sr. was his father. I'm not certain those "admissions" by Obama would be considered "hearsay." Does anyone know if there is a public statement (written or spoken) where Obama states Sr. is his father? If so, then it would definitely not be hearsay, but rather his own admission.
A spoken statement to that effect would be O's speech to the 2004 National Democrat Convention in Boston.
His book(s), authored by him, state the same in print. So does his personal biographical information in, e. g., The Almanac of American Politics, which I'm sure he approved before it was submitted for publication.
It's still hearsay. He can have no personal knowledge of who his Daddy was. He's relying on what his mama told him.