I read that when you say something out loud, it helps the brain incorporate that idea more strongly. So if your Thanksgiving leans more toward squabble than gobble, take a minute before you leave the house, or before company arrives, to declare (yes, out loud) that you will enjoy yourself; and no one will get under your skin. Feel free to choose declaration(s) that are meaningful to you. You might just find it makes a difference in how the day unfolds.
Gratitude Journal: 100 Days Of Gratefulness: Be Happier, Healthier And More Fulfilled In Less Than 10 Minutes A Day