Is the inheritance that you will be receiving from your spouse?
Canada does not actually have what they call an inheritance tax, so you personally would not be responsible for any tax on your inheritance. Instead, the property and assets which are left by the deceased, are taxed on the final tax return of the deceased which the personal representative or the executor of the will should arrange to have prepared.
This is done by the assumption of a "deemed sale" of all assets at death, except in the case of a bequest to a spouse. A deemed sale means that any capital gains are recognized and become taxable on the final return of the deceased. So as an example, if your mother held stocks, they would be valued as of the date of her death and taxed as if they had been sold at the value. Once those taxes are paid from the assets of the deceased on the final return, then the remainder of the assets pass to the heirs without further tax due.
If this was helpful please press the Accept button. Positive feedback is also appreciated.