Ah, the answer is incredibly simple: my aunt speaks fluent German! She moved to Austria as a young woman and picked up the language, and picked up a husband. :) She speaks Korean, of course, so that's how we all are able to communicate with her. Recently we were at a family gathering, and one of my extended relations is married to a German fellow (who speaks both German and English fluently), and it was utterly cool seeing my aunt and him chat away in German (and sing "99 Red Balloons (Luftballons)," the popular 80s tune by the German singer Nena, in their native German)!