U.S. Presidents riddle

Answer for the previous riddle: N for NINE
The next question is in the video below.

You can get the answer if you click the link inside the video.

Next riddle: How could the 22nd and 24th U.S. Presidents have the same parents, but weren’t brothers?
 
My videos can be found on YouTube. The riddles are inside my videos. I upload videos with this username: IhaveBIGplan
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