These are not completely tax-free, but are less costly than regular ones. For the most part, leaving Canada lets you leave our tax system behind. It's an income tax calculation on the assumption that you sold all your assets. You should always consult your tax advisor before leaving the country. If your only income is from your job and you are already making your maximum RRSP contribution, perhaps a look at your parents may be your next step.
Significant liabilities arise when they die.
Their RRSPs and RRIFs also go in to the final return to be taxed. Ensure your parents' taxes on death are minimised. It's called estate planning - making sure your parents' affairs are organised to the benefit of their heirs and not to the benefit of Revenue Canada. Our tax rules permit most of us to sell our homes on a tax-free basis. Your 'principal' residence can be sold with this in mind, but does not have to be a city home.