When setting up a family account you can set one user to be the "Family Manager" and then add additional users as "Family Members".

The reason this could work as an option is because in families, only the family manager will need to provide an email address, and the family members who are set up under them don't need one because family members aren't able to log into their own accounts.

Once the family manager creates their own account and also creates the family member account, you will see both accounts will appear to be registered to the same email address, which belongs to the family manager, and so all email notifications relevant to these two accounts will be sent to that email address.

Now in regards to managing these accounts, both customers can share the login details of the manager account so that they can log in and manage each account as needed.

You can find more info on how to create a family member here: Adding a family member to an existing profile

And you can share this guide with customers so they can complete this set up on their own here: How can I set up and manage an account for a child or partner or any other family member

Gmail users are able to use the same Gmail email address multiple times using their "Plus Addressing" feature, also known as sub-addressing, which allows users to create variations of their email address by adding a "+" symbol and any combination of characters after their username, before the @ symbol.

Example: If George and Helen want to register for two accounts but want emails regarding their classes and payments to be sent to the same email address ([email protected]), this can be achieved by registering one user to [email protected] and Helen to [email protected].

Now George will need to log into his account using the email address [email protected], and Helen will need to log into her account using the email address [email protected].