The likelihood of Trump sending troops across the border is pretty low right now. The chance of Trump trying to destroy Canada economically with America's weight is relatively high.
Please continue to disentangle Canada's economics from the US; it's much more likely your kids starve then are shot.
The odds might be low, but they are substantially larger than zero. Most people I know are preparing in some way by offshoring what money they have, researching places of refuge, etc.
The path to violence is:
* imposition of punitive tariffs by Trump
* Retaliation which escalates to energy export tariffs.
* At some point Canada shuts off electricity transfer to the US and restricts water transfer, which shuts down the eastern seaboard. Trump declares this an act of war.
US doesn't need to invade Canada in response to tariffs etc. Given the relative sizes of the economies and their interdependency, it's much, much easier for US to hurt Canada than for Canada to hurt US economically.
Please continue to disentangle Canada's economics from the US; it's much more likely your kids starve then are shot.