Even if he was born in Hawaii, there is the question of what makes a “natural born citizen”. There is a LOT of data that says that to qualify as a natural born citizen, both your parents must be citizens. And we are 100% sure that Obama Sr. WAS NOT a citizen.
But we are NOT sure that Obama Sr. was his father. For that matter, we don’t even know if he is currently using his real legal name. The only evidence we have that Obama Sr. was his real father is hearsay.