iCloud iCloud custom domain and number of email addresses

[pdp1]

On the Apple website, it says each iCloud+ subscription can have 3 email addresses for each domain. It also says a domain can be shared with up to five other family members, so 6 total members. Does this mean each member of your family can have 3 email addresses on that domain (ie 18 total email addresses) or can there only be a cumulative total of 3 email addresses per domain?

 

[MacLeod74]

Each member can have 3 different email addresses per custom domain.