Visiting Partner’s Family During Yom Kippur

Hi! My partner’s family is getting together for a family reunion next month. It’s a long get-together, and Yom Kippur occurs during the time we’ll all be together. My partner’s aunt and her husband are Jewish and they are the hosts/organizers for the reunion. Would it be appropriate or make sense to get them a card or small gift? I’m not sure where this holiday sits compared to other Jewish holidays or how it’s celebrated, and I’m not sure how religious they are. I don’t have anyone else in my life right now that I could ask, so I was hoping maybe this sub could help! Thank you to anyone who offers their thoughts ☺️