Another person looking for a parent is Elizabeth Ponton.
Her father, Ian Ponton, left his Croydon South home in June 1979 and was last seen at Waverley Park watching a VFL football game.
Ms Ponton said he left home in a red tracksuit with "Jesus loves me" emblazoned on it and vanished.
"There's lots of different stories about what happened to him," Ms Ponton said.
"Every day of my life, it's always there. We don't know if he's alive or dead."