Sarah Onyango Obama, known as Mama Sarah, the third wife of former US president Barack Obama's paternal grandfather, died on Monday in the lake-bordering western city of Kisumu, in Kenya, the Kenyan presidency announced. She was 99 years old. "My family and I are mourning the loss of our beloved grandmother, Sarah Ogwel Onyango Obama, affectionately known to many as “Mama Sarah” but known to us as “Dani” or Granny," Obama tweeted on Monday. "We will miss her dearly, but we’ll celebrate with gratitude her long and remarkable life."