Just talked to the ticket office, and the official word is that the season ticket holder doesn't have to be one of the attendees at the game, as long as the people who do attend have access to the online season ticket holder's account. Thus, a person can buy tickets for their family members, as long as they are okay with the family members having their account login information.
Not sure how it works, but it sounds like people need to log into the account to access the tickets once at the stadium.