its a doggy
Insanitity
With knives.
He sends murderers to do it.
When the murderers kill Banquo, Fleance (Banquo's son) flees. And the murderers only kill Banquo not Fleance however Macbeth told the murderers to kill both the father and the son.
Enough to kill you.
Yes, it does happen.
Macbeth sets an ambush for Banquo with three murderers. The murderers kill Banquo but Banquo's son Fleance escapes.
The murderers fail to kill Fleance.
Macbeth instructed the murderers to kill Banquo and his son Fleance.
Banquo is on his way to a royal banquet when he is attacked by the murderers sent by Macbeth. The murderers ambush him and kill him, but his son Fleance manages to escape.
Professional hitmen. Although with the murderers he hires to kill Banquo, he goes through the rigmarole of rehearsing their grievances against Banquo, arguably this is a sham to make Macbeth feel less like the kind of scum that hires professional hitmen to kill his friend. By the time he hires murderers to kill Macduff's family, there is no more pretence.
Macbeth sends murderers to kill Macduff's family in an attempt to eliminate any potential threats to his own power. This ruthless act solidifies Macbeth's descent into tyranny and cruelty, as he seeks to maintain his position on the throne at any cost. The murder of Macduff's family ultimately leads to Macduff seeking revenge against Macbeth, contributing to his downfall.