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I count 12 to 16 depending on whether you count half-brothers.

Presidents who the first-born child:

? Washington ( older half-brother) , first-born of his mother.

John Adams

Madison

Polk

Buchanan

Grant

Harding

Coolidge

? F. Roosevelt ( older half-brother) - first born of his mother

Truman

Lyndon Johnson

Ford

Carter

? Clinton (older half-brother) - first born of his mother

George W. Bush

? Obama (older half -sibs from father's first marriage) but first born of his mother

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14y ago

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