It was a touching moment and well received by the audience looking on at Alexandra Palace.
Williams beat off world no.1 Mark Selby in dramatic fashion to reach the quarter-final stage.
MASTERS SNOOKER RESULTS LIVE: LATEST SCORES FROM ALEXANDRA PALACE
Wilson dispatched Barry Hawkins to mark his ever win here at the Masters, setting up the clash with the legendary Welsh potter.
At 5-0 down it looked gloom for Williams but perhaps the words from his son had an impact as he went on to win the frame and finally get his name on the board.
Snooker legend and commentator John Virgo said: “Mark Williams’ son has just come over.
“I don’t know if he’s giving him any advice.
“[Maybe] he’s saying ‘don’t give up yet dad’.”