Each account in the family can be one of three different service levels. The main difference between each service level is storage limits and cost.
- Lite - 250 MB email, 100 MB files (eg photo galleries) - $10/y
- Full - 1 GB email, 1 GB files (eg photo galleries) - $20/y
- Enhanced - 15 GB email, 5 GB files (eg photo galleries) - $40/y
- Premier - 60 GB email, 30 GB files (eg photo galleries) - $120/y
Additionally, Enhanced accounts can have "personal" domains and aliases. The only difference between personal domains and family domains is who can manage the domains. For family domains, they're managed on the Manage -> Domains screen, and can be managed by any administrator of the family. For personal domains, they're managed on the Advanced -> Own domains screen by the particular user that owns the domains.