Canada has no gift tax, so you can give your children as much money as you like, it is not taxable as income or deductible as an expense.  Helping your children is a great way to reduce your estate while you are still here.

However, if you gift any property that is not considered your principal residence, it will be subject to capital gains. Which is based on the fair market value when you gift it. Example: Purchase price $400,000, the FMV of the home upon gifting is $600,000. You will then be subject to capital gains on $200,000 at 50% of that amount. So you will pay tax on $100,000. For more detailed information on Inheritance Tax Laws, review this link from TurboTax.