Granny Sarah by which the former US president call his grandmother, Mrs Obama affectionately defended her grandson during his 2008 presidential campaign, when he was said to be Muslim and not born in the US.
Her home became a tourist attraction when he was elected as the first black US president.
Sarah Obama was the third and youngest wife of Barack Obama’s grandfather.
She died early on Monday at a hospital in the western town of Kisumu,
Kenya’s President Uhuru Kenyatta said on Twitter that Mrs Obama was “a strong, virtuous woman” and “an icon of family values”.
Before her grandson became a household name, Sarah Obama was well known for the hot porridge and doughnuts she served at a local school,
She became more famous when Mr Barack Obama visited Kenya in 2006. At the time he was a senator from the state of Illinois, but a national celebrity in Kenya, and his grandmother spoke to the media about his rise in politics.
He returned in 2015, becoming the first sitting US president to visit Kenya, meeting Mrs Obama and other family members in Nairobi.
Mr Barack Obama visited his step-grandmother’s home in the village of Kogelo in 2018, after leaving office as the US President.
The President in his post on twitter expressed how precious his Granny or “Dani” was to him and the family