Lomu - who played 63 matches for the All Blacks and was rugby's first global superstar - died on November 18, 2015, of a heart attack, after a long battle with kidney failure.
As the anniversary nears, Lomu's brother, John, and sister, Sela, have spoken of the ongoing pain after his death, including the fact they have no contact with their nephews, Brayley, 9, and Dhryeille, 8.
The pair are also upset Lomu's grave still does not feature a headstone. Lomu's widow, Nadene Lomu, has control of the grave site.