Viking All syncronization of the data is done thru the shared image database, namely using ini and dossier files. https://tonfotos.com/docs/library/setup/#multi-user-collaboration
So if you will manage to establish shared access to your network folder for your remote family members, you will be able to collaborate on the same archive, and all changes will be automatically syncronized among users, regardless they use family license or several independent licenses.
Also, each user will be also able to index thier own separate set of images. However, if you are syncronizing people information using dossier file, all people data will be synhronized, even if some of users do not have access to photos with those people.
Basically, family license is a pack of 5 single licenses that are registered to same email and come with great discount.