M.L.
You might mention that you would like to host Thanksgiving in a year or two when you're confident enough that you can do it to everyone's enjoyment. Between now and then, you can practice, practice, practice. Pick your relatives' brains! Find out how they plan and prepare the meals. They must have a system! Most people like to share their expertise and their wisdom - give them the opportunity to teach you.
When it's at your house you can change some things - like the amount of salt in the food. You'll have salt on the table for those who want it, but you can also mention when you serve the food what the spices are that make it different from what everyone is used to.
Keep in mind that when you do host the family, you want them to go home feeling fine about the food you served, but even finer about what an enjoyable time they had. If they're glad they came to YOUR house, you will have done very well indeed.