Definitely you should submit study permit or TRv separately for each kid if you didn't submit initially with the application. If they are in the school age you can submit study permit although in my case the asked me for TRv while my children are above 7 years old so I submitted TRv for them separatelyhow do you know that you have to submit study permit, did you received any email..??
For my sister she has 2 kids and we received Medicals also for them, but not sure if we need to apply for Study permit for them separately.. Can someone please advise...
Thanks