The Speaker of the House of Representatives is second in line to become president if the president can no longer carry out his duties. The Speaker would become president if both the President and Vice President died in office, resigned, or otherwise became incapacitated.
John Adams
George Herbert Walker Bush and George Walker Bush were father and son who both capaigned as the president of the US
John Adams was both.
John Adams was both.
According to the line of succession, the Speaker of the House would then become president.
John Adams was both.
3rd in the line of succession would be the Speaker of the House (assuming you meant the president and vice president with "both").
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The Speaker of the House of Representatives would then become president.
If both of them are killed at the same time then speaker of the house becomes president
Fortunately this event has never occurred.