Thanksgiving is one of my favorite holidays. To me, Thanksgiving is a time for family and friends, great food, fellowship, and reflecting on the many blessings in my life. Ask a preschool aged child to tell you why they celebrate Thanksgiving, and you most likely won't hear much about giving thanks.
An easy way to solve that issue is to actually explain what being thankful means, which isn't an easy concept for little ones to understand. Children may not know what it means to be greatful, but they do understand that some people and things make them feel extra happy. You can talk to your little ones about what those things are, and try to help them make the connection between those happy feelings and being thankful.
Including a discussion on friendship and helping others durring thanksgiving preparations will also help children to make connections to the true meaning of Thanksgiving, and help to shift thier focus from the turkey. Involve your children in preparations for your meal, and allow them to help serve your guests, or let your child choose and donate food items to a local food bank to give them the experience of serving others.