It's easy to want to take on all the responsibilities at Christmas to avoid inconveniencing people, but that just puts added stress on you and will cause you to resent other family members. Jesse said you should delegate responsibilities as you need them: ask Aunt Linda to bring a side dish or have your cousin help clean up.
"Being assertive may also mean setting boundaries," Jesse added. "If you have a relative who is especially problematic, you might have a frank conversation with him or her in advance about your expectations. I'm not saying these situations are easy, but sometimes they are necessary to ensure that everyone can have a good time."