Alex Kunda has never missed a day of school in his life.
His parents even offered to take him to Disney World in an effort to thwart his perfect attendance record.
But the high school senior is resolute - and it's not just because he loves to learn.
The Georgia, US, schoolboy has reportedly shown up to school every day since kindergarten, despite his parents' worries he was putting too much pressure on himself - because he promised his sister he would.
His older sister Miranda died in 2006 from autoimmune disease when Alex was just four, reports CBS News .
"This was the one promise I remembered making to her. And I can't make any more promises to her in person, anymore. So the one promise I did make, I was going to keep it," he told the network.
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His sister was ill with the debilitating condition for most of her short life.
Despite that, the little girl who loved school never missed a day of first grade - right up until the day she died.
Her perfect attendance record certificate was reportedly awarded posthumously to her little brother Alex.
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After he crossed the stage the then-four-year-old told his dad, Preston: "I'm going to do this for her," his mum Arlene said.
Today, thirteen years later he fulfilled his promise and graduated form Brunswick High School with his perfect attendance record intact - just like his little sister.
The family have set up the Miranda Faith Foundation for children in Miranda's memory.
