My girlfriend wants me to go with her to trader joes

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The problem is, her sisters going too.. as well as her boyfriend... I told her I really don't want to because the store is already really small and cramped and always busy, so walking around there with 4 people will be really odd and uncomfortable... it was supposed to be just her and her sister but her sister doesn't really want to do anything without her boyfriend... and my girlfriend doesn't want to be alone with them...
Don't ask.