Answer:
The excerpt develops the plot about the party to which the family is inserted.
Step-by-step explanation:
We can see in the excerpt above that the family is part of a social event, such as a party, for example. However, the family is acting in a peculiar way, different from everyone else, which is drawing the guests' attention to them. From this we can see how the excerpt plot intends to develop the events that took place at the party and how this impacted the family.