Can I use my sisters pass without her being there?

I agree I'm pretty sure they check an ID as well.

If she has the year pass she has to be present to get you and up to 6 kids in because they check id's sometimes but she doesn't have to stay

Possibly if there's no name on the pass

Hi Shawna, We do check IDs to make sure the person whose name the membership is under is using the card. With our "Add Two Guests" option, your sister can bring up to two guests to the museum every visit. This option is $25 in addition to the regular membership price