Hi,devin
If you are or will be Quebec resident, your spouse and kid would enjoy all the benefits whatever Quebecois have. It does not matter which custom they get through. All the immigrants flting from Asia should report to Immigration Bureau in Vancouver.But it does not affect your destination.
best wishes!
No matter what kind of immigration visa, federal or quebec, your family members can directly come to Montreal. But if they have no visa for usa or europe, they can only enter customs at Vancouver.