Every person born on US soil is a US citizen, no matter where the parents were born, nor of what country they are citizens of.
If Obama was actually born in Hawaii, he himself is a natural born citizen.
If he wasn’t born in the US, he can’t be POTUS. The parents are irrelevant.
The question is why Obama can’t or won’t produce his borth certificate. My guess is that the father is unknown, or not the Kenyan he claims.
Without a birth certificate, none of us can prove natural born citizen status. Mine is in the Safety Deposit Box at the Bank, where is his? If you lose it, the local deoartment iof health will make a cope for you.