The article uses the word "mask" (and "face") quite a bit without mentioning that it is the original meaning of "person".
http://www.etymonline.com/index.php?term=person
Perhaps the omission is deliberate, because it does mention the origin of "family" from "servants".
http://www.etymonline.com/index.php?term=family
(A delightfully unapropos Yeats quote is hidden in plain view at that last link. I wonder who stuck it in there.)