Hello,

If you're not at interested in teaching and want to appear for UPSC only then you should follow the same path, there is no other way than convincing your family about the same, I can understand that their concern is about your future professionally, see UPSC is quite competitive exam, and each year there are humongous number of candidates appearing, so you're not just competing with people who have just graduated but even those who are already graduated and  appearing for final attempt, so it's good to have a back up plan in this regard, hence probably they are thinking teaching would be more suited, if you're only focused on UPSC and nothing else, then you have to make your family understand your point of view, other than this if you're not interested in teaching, and want to have another career, then you can consider that as well your alternative option, you need to have a thorough discussion with your family regarding this. make them understand your viewpoint.