Labour leader David Cunliffe's incorrect claim that his grandfather won a Military Medal was the result of a family mix-up, his office says.
On Saturday, Mr Cunliffe told a Young Labour conference that his grandfather Bob Tuke won the medal after his World War I service.
He said: "At my local RSA, I spoke of my grandfather Bob Tuke, who fought in World War I.
"Although his letters home understated it, he lived in constant fear; he lived with lice, damp and dysentery. He watched his friends die in France, Egypt and Gallipoli.
"He was awarded a Military Medal for valour, but hardly mentioned it to his family."