I am a traditionalist. I love to look forward to the traditional dishes of Thanksgiving. My brother on the other hand has for years tried to change up Thanksgiving to resounding "boos" and "polite hisses". We all love him but leave our turkey and gravy alone. He no longer hosts but has yielded the joyful day to his oldest son who is Mr. Tradition. The meal is a broad version of a potluck and scrumptious.
To your question, I would suggest preparing one, just one, dish from your families ethnic background. Or add a simple soup course. Then leave the rest of the meal alone and enjoy being with your family all in one place feasting!