Thanksgiving is a traditional American holiday, equivalent to the Chinese Spring Festival. Family reunion is an important holiday custom. I guess Chinese parents nowadays don't care much about this holiday, after all, it's not a traditional Chinese holiday, but as long as you go home to accompany them, no matter what day it is, the whole family is the happiest thing. As for what gift to give, I don't think it's necessary to be very expensive, just send it to your heart.
For example, you can give your parents a cashmere scarf each. In winter, your parents' health needs to be well taken care of. Giving a scarf is also a token of your own thoughts, and I believe your parents will feel warm in their hearts.
You can also go online to customize a real-life doll of a family portrait and put it at home as a decoration. Every parent will be very happy to see the whole family together. Of course, going home to eat together is the best gift. I hope this helps you.