You need a residence permit to join your family or a relative in Sweden. Information about what is required and how to apply can be found on the website of the Swedish Migration Agency.
Make sure to read and follow all instructions regarding required documents. Missing documents could delay the process.
If an interview is required for your application, you will receive an email from the Migration Agency asking you to book an appointment with the nearest embassy or consulate. In Canada all interviews have to take place in person at the Embassy of Sweden in Ottawa.