If more than one student is logging into the same device - PC or iOS device, make sure each student logs out properly (Click link for logout procedure). 

You may also need to clear the browsing history/cache before the second student can log in successfully and see their courses - or the second student may need to log in by using a different browser (Edge instead Chrome, for example).

Useful Links:

Clearing the Cache: 

• Google Chrome   
• Microsoft Edge
• Safari on mobile devices  on Mac
• PC World: How to Clear Your Cache on Any Browser

Canvas Parent Guide (GCS) - PDF

Canvas Student Guide

Video Guides from Canvas