As Christmas is not a traditional festival of China, we never think about preparing the greatest food for it. Seeing that your family is a combination of the west and the east, I think you may prepare some Chinese food as well as western-style food. In this way, your parents-in-law and other Chinese relatives can find their food, and so can you. In China, the staple food is steamed rice or noodles. Then, you may learn to cook several Chinese dishes. Wish you a happy Christmas!