“There is a record in the safe at the Maseno School of an older brother named Joseph Obama, who attended the school until 1951.”
A record number is given for the card of BHO SR, but NOT for the claimed brother. In a card record system like that, as they clearly stated, each student has a card and on the information for the student is summarized on that card.
There are no quotes around the comment about the brother so it is not indicated that the comment was a verbatim statement being claimed to be read from any record card.
It the other brother existed and was not just a cousin with the same tribal name, he would have his own numbered card but no such card or card number was referenced as the source of the claim that the brother left the school in 1951.
This story at the school is a hearsay account written by a newspaper reporter. He claims to have seen documents but provides no images. No older brother, Joseph, exists anywhere that I have seen in all of the extensive family coverage and interviews of the Obama clan.