[Data-modeling] Type for groups/sets of people (or any entity?)

[Tom Morris]

It seems like there are a number of places where it's useful to refer
to arbitrary groups of things.  I'm most interested in people (twins,
brothers, collaborators on a jazz album, etc), but I can imagine that
it could be used for almost any type of object.

What do people think about defining a group/set type which has a
single property, members?

Tom