Auma Obama attended his 2009 inauguration and was a big part of her brother's 2015 visit to Kenya.
Mr Obama last visited the village, in 2006, and before that in the early 1990s when he first ventured on the journey to discover his heritage.
Obama arrived in Kenya, the country of his father's birth, over the weekend for a private visit, his first to this country since leaving office, AP reported.
He also recounted his first trip to the area while in his twenties, from the slow train out to the village in a auto filled with chicken and sweet potatoes, to having to killed those chickens just before dinner if he wanted to eat. Then he had to pile into a matatu - a minibus taxi - "even more crowded than the bus", before a long walk to "Mama" Sarah's house.
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On Monday, he is expected to inaugurate the Sauti Kuu Foundation's Sports, Resource and Vocational Training Centre, and thereafter give a brief remark, before jetting out to South Africa.
He said he visited his father's grave which gave him more satisfaction that no five star hotel could have given him.
The former United States president applauded his sister for her great achievement in the initiative of the Sauti Kuu foundation.
They will also be able to benefit from classes on work ethics, civic education, environmental conservation and financial literacy.
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Hailing "real progress" in Kenya in recent years, he highlighted corruption, tribalism and rocky elections as challenges that remain.
Another issue that has got Kenya's talking is the report in Tanzanian newspapers that Mr Obama and his family spent eight days in the famous Serengeti National Park before travelling to Kenya.
"We wanted to appreciate Barack Obama for what he has done". He walked out when the younger Obama was just two and died in a vehicle crash in Nairobi in 1982.
Later Monday he left for South Africa where he will deliver the annual Neslon Mandela lecture which this year will mark the late anti-apartheid icon's 100th birthday.
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