[bluecat6]

His signature is on the birth certificate. How can it be reasonably argued that isn't an "acknowledgement" of the child's birth?

Sorry, but it it is not.

Even if the WH LFBC is authentic (that's a big, giant IF). The parental signature is (Stanley) Ann Dunham Obama. There is no father signature at all on the that document.

Obama senior never acknowledges his son in hi until April 1964.

[OldDeckHand]

Substitute "name" for "signature". Barack Obama Sr. is - QUITE CLEARLY - listed as the father on the birth record.

Obama is married to Dunham and his name his on the birth certificate, and as such, he was the natural legal father.