I'll have a closer look at how CBSubs Coupons works.

Is there a way to link it to the main subscription? In other words if the main subscription does not renew the other family members would also expire or conversely when they renew the others also renew?

Oh that might be the best bet. So it looks like it would be a combination of using Auto Actions and CBSubs Coupon.

Here is what would be ideal:

New signups:
They fill out an registration form and there are extra fields to add the family member name and email address. Based on the number of family members would determine how many users are created (each with their own login credentials)

Payment is the same usual (one fee per family, irrespective of size)

So you are suggesting I create a coupon using SQL actions and then those would be used by the additional members. Am I understanding that right?

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How do I handle existing members who wish to add family members?

Besides the manuals are there any other documents, guides, etc to help me with CB Auto Actions, CB Paid Subscriptions 3.x action and SQL Auto Actions. It may be beyond my scope of comprehension to find an effective solution.

Does the coupon code get auto generated and is it only unique to each user?

For the manual coupons, do I need to make unique codes for each user to link to their profile?