The holidays can be a time filled with joy and peace and giving... and they can also be a time of visiting with family whom you moved far away from for a reason. If you would rather stick needles in your eyes than sit across from them at the dinner table, you are probably dealing with a toxic person. And the best way to deal with a toxic person is with healthy boundaries.
Let me offer up this metaphor. People are like plants. We need water and sunlight and nutritious soil in order to grow to our full potential.