The Kenyan side of his family probably sold slaves, particularly since there was a strong Arab\Muslim connection in Kenya.
Obama’s grandfather converted to Islam. So far as we know, the family weren’t Muslim traders in slaves. We do know that two ancestors on his mother’s side of the family were slave owners.
“The Kenyan side of his family probably sold slaves, particularly since there was a strong Arab\Muslim connection in Kenya.”
Mombasa was a big slave-exporting port.