But the craziest thing? The Duncans also have a stake in Wanderers rivals Sydney FC, with Glenn a director of Aquarius Equity Pty Ltd.
It's only small, but it will be interesting to see where the Duncan loyalties lie tonight.
CommBank Stadium is SOLD OUT for the derby.
One thing to watch for this weekend in the A-League Men. Who now sits on the Western Sydney Wanderers throne?
Paul Lederer stepped down as chair on 14 June "due to personal family matters and ever-increasing global business commitments".
But his decision came amid controversy.
28% is owned by the company of Pirtek founder Peter Duncan and his son Glenn, who sits on the club's board.
Lederer said in June he would keep his stake in the Wanderers, but one of the other shareholders would become chair.
Happy A-Leagues day, please enjoy 1000 words on the competition's past, present and future. https://t.co/Ox4GLU9BFv
Written with love... my first job in sport journalism (before I went into law/public service/politics) was on the matchday program The Full90 from the early years.
Extraordinary stuff here. The workers were building the 30m high platform with scaffolding stored in the water. Divers complained it was swaying too much.
World Aquatics, in consultation with the Brazilian Diving Federation, has made the difficult decision to cancel the World Aquatics High Diving World Cup and the World Aquatics High Diving Junior Championships in Brasilia, Brazil, due to deteriorating weather conditions and concerns about the safety of the competition venue.
Full statement: https://t.co/cUNWTJ268g
Bulldogs media rep just pointed out this is the highest crowd in Vic this season. (Perhaps apart from MCG double header.) Very strong turnout, great vibe on the hill.