Your whole family or classroom is welcome to watch the lessons together! However, only one student per account can submit their work for feedback.
For each student that wants to receive feedback on their assignments, it is best to have their own Iguana account. Submitting assignments from different students will cause confusion from classmates and/or instructors, making it hard to offer constructive criticism since it will be difficult to compare growth, habits, etc., from one lesson to the next. As you can imagine in any classroom, mixing the work of different students removes the ability to have a reference point for whose work belongs to whom. As a result, classmates and teachers will refrain from offering feedback since it will be too hard to track who they’re critiquing.
Hope this helps!