mine changed several years ago
from employee and spouse to employee and one dependent.
So you had employee only, employee and one dependent, and then (no number limit) family.
That was because of complaints of single parent with one child paying almost twice as much for family as an employee and spouse and both covered two people.
I mentioned it somewhere else, some sources I found put average US income at $40K but median income (50% of earners) at $26K.