In Ontario, we have full testamentary freedom, with one exception (that you can’t cut out a spouse or minor child who would be entitled to support). If you aren’t married or have a prenup, or don’t have children under 18 or who need support, then you can do pretty much whatever you want. You can choose to leave an equal share to each of 70 people you randomly selected from the phone book, as Luis Carlos de Noronha Cabral da Camara did in his will. You can choose to leave your entire estate to the queen of England. You can leave your entire estate to your dog. Ultimately, you can do whatever you want, including taking revenge on people who wronged you, as long as you consider whether there is anyone who might have a right to inherit.
And if you think you will automatically inherit because you are someone’s child, think again.