Final answer:
The Christmas traditions exemplify the family matters relationship dialectic.
Step-by-step explanation:
The Christmas traditions described by Shelby Creech and her family exemplify the family matters relationship dialectic. This dialectic refers to the tension between the desire for individual autonomy and the desire for connection and belonging within a family.
By going to Christmas Eve mass together, having dinner as a family, and opening presents, Shelby Creech and her family are engaging in activities that strengthen their family bond and reinforce their shared values and traditions.