Before you can add an additional contact person to a child, you need to have the name of the person and the email address.
Go to the child's profile for whom you want to add a contact person. Find the 'Contacts' tab and press ‘New Contact’.
As seen in the photo below, Famly will give you the fields to input for the contact person.
You have three options to select from under the 'Send Login'. No login, Parent login, or a Family login (descriptions are within the screenshot below.). Once selected, press the Create button when you are done.