Barrie Police expect to remain on the scene of a double murder through the weekend.
A post morten showed that the victims, 73 year old Alan Mallinson, and his 39 year old son Matthew died of stab wounds.
Their bodies were found inside a home in Letitia Heights.
45 year old Robert Twiss is facing charges of two counts of first-degree murder, one count of indignity to a body and flight from police.
He will be back in court on Wednesday.