BE, we only take family now on a space available basis (and since our -400s only have 6 seats....). Definition of family is also highly restrictive: wife & kids (or live in partner if you can prove you live together). Parents and others are a no go.
Furthermore, wrt security, all wives & kids are registered with TSA as being allowed to fly on our a/c.
Many moons ago, in the -200 days, joe public could buy a ticket to one of our destinations.