The event took place at a home on Chemin Saint-Antoine in Laval's west end around 7:20 p.m.
According to authorities, four men entered the home and tied up the two occupants – a 51-year-old man and his son – before fleeing the scene with several objects.
The victims alerted police after the suspects left the home.
The 51-year-old man was injured in the event but police do not fear for his life.
Police say the man is known to them and they are treating the crime as a break-and-entry, armed robbery and assault.
No arrests have been made yet.
Authorities are also looking for information about a M4 carbine machine gun they found at the victim's cottage in Lachute.
Second home invasion could be related to drugs, police say
Half an hour later, intruders entered a home in Montreal's east end and beat a man with a blunt object.
Police said more than one person entered the home on Bourbonnière Avenue near La Fontaine Street.
Montreal police Const. Anie Lemieux said the suspects fled following the attack.
The victim, 51, was taken to the hospital for severe injuries but police said his life is not in danger.
Lemieux said the man is known to police.
"We think that this incident could be related to selling drugs," Lemieux said.
Investigators will try to meet with the victim today.
No suspects have been apprehended so far, and police said investigators do not have a clear description of the people involved.