Can one child be left out of a will in Canada?

Yes, one child can be left out of a will in Canada. While testators have the right to distribute their assets as they see fit, the law does require that dependents, including children, may have the ability to contest a will if they feel inadequately provided for. This is particularly relevant in provinces with laws that protect the rights of dependents, such as the Family Law Act in Ontario. Ultimately, the specifics can vary by province, so it's advisable to consult a legal professional for guidance.