I have almost same case as yours, but still haven't got the results back, I applied on Feb 3. I have bachelor in English language and applied for diploma in IT business management. I didn't include my wife in the application and provided strong explanations about why choosing a diploma, but I think I will get the same refusal results as yours. I believe excluding your spouse is better in such applications. They think you are both going to stay there after your studies. Also, you have chosen same city as your sister's residency, that would make some doubts too, choose a cold place like Calgary next time.