(CNN) -- It's a sunny April afternoon at the University of Rwanda College of Education in Kigali. Some students huddle in groups conversing in hushed voices; others hurry between buildings carrying books. Exams begin in a week.
On a grassy knoll behind an office block, Jean Claude Nkusi is giving his 24 children a talking to. "Study hard everyone," he says. "If you work hard you can improve your life and make it better."
This isn't your typical family. Nkusi is 23. None of his "children" share his DNA. In fact, the only thing linking them is that they're all genocide survivors -- ethnic Rwandan Tutsis who lost their families in the 1994 violence that killed 800,000 people.