“Unless you can prove otherwise, he went to the school until 1951 and probably died shortly after, since another brother was later named Yusuf.”
This was a stay uncorroborated hearsay comment reported by one reporter which does NOT rise to support probability of anything, IMO.
I have had numerous contacts with reporters and the almost always get something wrong or spin something. I always look for source document images or verifiable records in public repositories or public databases.
The British National Archive has all of the Obama family accurately recorded to colonial standards up until they left Kenya and with all of the serious researchers scouring it for family genealogical data it is extremely unlikely that the existence of an older brother, Joseph, would escape worldwide Obama family researchers. Such a person would be yet another long lost uncle of Barry’s and would be big news, if found, IMO.