Bourke and Stevenson's gutsy performance put behind them the memory of finishing runners-up last year.
A withering pace in the last 500m saw them move from third to eclipse the Polish and Australian combinations, winning in 6min 38.04s, 1.32s ahead of the Poles.
"We're extremely proud of her [Bourke]," said Jay, who teaches at Takapau School.
Ex-Takapau and Terrace School pupil Bourke, 25, who is based at Cambridge, is pursuing an accounting degree after two years of chemistry at Otago University, where she took up rowing.
Jay was dumbfounded the TV commentators didn't realise the Kiwi pair were catching up on the leaders in lane six.
"As New Zealanders do, they crept up [on the other two boats] and passed them. It didn't seem to matter whether they were in the middle or out on the edge.
"It was lane six but the girls proved them wrong."
Jay and Phil, who is the Flemington School principal, didn't go to watch their Olympian daughter, a former Central Hawke's Bay College dux, because of their commitment to work.