This will depend on how you structure your will. You can have more than one will to govern your assets in different locations. If you create a valid will in BC to govern all of your assets around the world, it may be valid, but your wishes may not be able to be complied with in other jurisdictions if they do not meet the requirements set out in that jurisdictions laws. For example, if you own property in a country where all of your assets automatically go to your first born son, your BC will that states that your assets are to go to your niece, will not be valid in that jurisdiction. If you own assets in other provinces and countries, it is important to speak with a lawyer or other legal professional from that province or country to ensure that your assets will be dealt with according to your wishes.