"He told me that he was waiting for political stability in the country before he can come," said Sarah Onyango Obama, who is in her early 90s, speaking of the July visit announced earlier this week.
Mama Sarah was the third wife of US president's paternal grandfather, Hussein Onyango Obama, and lives in the small village of Kogelo in western Kenya which is home to a number of the president's Kenyan relatives.
Although Mama Sarah is not a blood relative Obama calls her "granny" and has visited her in the past, before becoming president.
"Even though we are excited about the visit, we will not compel him to come to Kogelo," she told Kenya's Daily Nation newspaper.
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"What I am happy about is the fact that he will be visiting Kenya. And that to me is a win for all of us."
On Monday the White House announced that Obama will visit his father's homeland in July when attends an entrepreneurship summit in Kenya.
Until now political scandal has blocked a presidential visit to his ancestral home.
For much of Obama's time in power, Kenya's President Uhuru Kenyatta had been under investigation by the International Criminal Court in The Hague.
Kenyatta was indicted on five counts of crimes against humanity for his alleged role in 2007-08 post-election violence that killed an estimated 1,200 people.
The 53-year-old son of Kenya's founding father protested his innocence until the case was dropped in December clearing the way for a US presidential visit.