E.g. The "T"s like on mowarchive.com/Our_Family_History.html.

And/or like the tree at the bottom of that page.

There would be options for the user to filter the view (by surname, date, location, etc), navigate (zoom, drag), and "sticky label" mark persons of interest.  The user could then center the view say, bounded by those persons of interest.
 
Right-clicking on a person would bring up the detailed information about that person.  Registered currators would be able to edit the details, add persons to the genealogy, etc.
Filters, for
example...

Dates: ? 1990 1942
Locations: ? HT
Subjects: fish person uniform persons lighthouse
Surnames: Cash Malone Russell ?
Collaborators: WMHM