Adam Hills is the first subject in the next season of SBS series Who Do You Think You Are?
Hills learned more about his great grandfather Oskar Kluckhenn, who was a high-class waiter living in Melbourne in 1914.
But his origins were mysterious, and as Hills learns, the year turns out to be of great significance.
The new series of Who Do You Think You Are? begins 7:30pm Tuesday on SBS ONE.