Zoo membership question

We have a family membership but planning a trip with my parents and sister. We always go to the Boston Rd entrance where you give your tickets as you drive up. Is there a way to work it if everyone I'm covering isn't in my car? Do we need to arrive and drive up together or do I need to have them in my car?

Zoo membership question

I've gone with a friend in the car behind her, and have always gotten in no problem. But you do probably have to be driving up together.