Hi Rebecca Penina Simon,
From Kristin Lundstrum's Blog called Clarity for Canvas Observers -- your parents will need the separate pairing codes for each of their children and then can add them to their observer account.
I still think they will only be able to actually view the activity of 1 student at a time, though they have both students in their observer account. They will have to switch between students.
The first blog post I mentioned should be all your parents need to understand what they have to do, but just in case here's another from Kristin: /blogs/lundstrum/2017/08/25/a-letter-to-canvas-observers
Hope I got closer to understanding your question,
Cheers - Shar
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