Auma said the state-of-the-art centre would give local youth access to books, internet and sporting activities.
From Nairobi he took first a "very slow train" and then a bus with "some chickens in my lap and some sweet potatoes digging into my side".
Former U.S. President Barack Obama urged Kenya's leaders on Monday to turn their backs on the divisive ethnic politics that have frequently spilled over into violence and to stamp down on corruption.
Obama is set to inaugurate the Sauti Kuu Foundation's project, which comprises of a sports centre, resource and vocational training centre run by his sister, Dr Auma Obama.
Obama announced the trip last week on Twitter, writing, "I'm traveling to Africa for the first time since I left office - a continent of wonderful diversity, thriving culture and remarkable stories".
"I was 27-years old when I first visited Kenya and at that time, I was working as a community organiser".
He said he visited his father's grave which gave him more satisfaction that no five star hotel could have given him.
Mr Obama poses with members of his extended family
Odinga's recently agreed to work with Kenyatta following a dispute over the 2017 elections.
The centre includes an global standard size football pitch sponsored by the German ministry of development cooperation, a basketball court funded by the Giants of Africa Foundation and other facilities, including a library and IT lab.
Kenyan television showed the former US president pulling his grandmother, Sarah Obama, clad in traditional garb, onto the dance floor and getting down to some music. But we know real progress means addressing the problems that remain.
President Kenyatta, who was joined by Deputy President William Ruto and other senior government officials, assured Obama that he can count on the support of all African leaders to scale-up youth programs under his foundation.
He passed away at the age of 46 soon after following a vehicle crash in Nairobi back in 1982.
After his visit to Kenya, Obama will fly to South Africa where he will deliver the annual Nelson Mandela lecture.
Federation Internationale de Football Association investigates England chants during Croatia defeat
Many people told me that they celebrated the goal [against England] like it was a goal scored by their own country. "There's an energy and connection that's back".