François Martel's father Georges, as well as two other seniors, died during a collision with an unmarked car Saturday afternoon in Dolbeau-Mistassini, north of Lac St-Jean.
Witnesses say the dark, unidentified cruiser followed two other provincial police cars which were travelling at high speed.
Martel believes it should not have been involved in the chase.
He said the Sureté du Québec should have a policy especially for unmarked cars, and that high-speed chases should be prohibited for them.
Martel said his 80-year-old father was an excellent driver, but likely didn't expect to see a third car following the first two identified police cruisers.
The investigation has been handed over to Quebec City police.