There are 2 types of communication templates you can create:
Booking / event registration
Lead
A 'Booking / event registration' type of template can only be used when emailing families from the Booking or Event modules.
This template will allow you to use the event form tokens, such as 'Attendee First name'.
A lead type of template can only be used when emailing families from the leads module.
When creating a new email, if your template isn't appearing in the list, check the template type. If your template is setup with the wrong type, you can duplicate the email and you will be prompted to choose the template type: