KOGELO, Kenya (AFP) - Barack Obama's friends and relatives erupted into song and dance in the Kenyan family homestead of Kogelo Wednesday, urging the nation's new hero to change the world and remember Kenya in the process. Swinging twigs and chairs in the air, men cheered and clapped while women shouted "Obama Obama" in the village where his grandmother lives and where his late Kenyan father was born. "This will change lives, not only here, but in the whole world," said Obama's 86-year-old step grandmother, dressed in her best traditional outfit and visibly emotional as she took reporters' questions. "If I go (to America), I will probably die of happiness," she said, stressing however that she wouldn't miss her grandson's January swearing-in ceremony for the world. Wild celebrations woke the sleepy village. People hugged each other as others ran aimlessly in the muddy streets after spending a chilly night glued to a giant screen watching results unfold on the US networks. The residents had braved a heavy downpour and deafening thunderbolts overnight, dancing and singing to choruses belted out by a live band. Children and youths gyrated to the songs, the lights of an army of international TV crews casting shadows on the tarpaulin tents. In the city of Kisumu, the regional provincial capital, huge screens were also mounted at a city park where hundreds turned out Wednesday morning after catching a few hours' sleep. Others crowded restaurants and shops to witness the first accession of a black man to the White House or formed little groups that went marching down the streets, waving placards and singing Obama's praise. Kisumu had on Tuesday declared Obama the winner of the presidential contest in mock polls held by two local comedians. President Mwai Kibaki was among the first foreign heads of state to congratulate Obama and gave Kenyans one more reason to rejoice when he declared Thursday a public holiday in a statement issued minutes after Republican John McCain conceded.