Answer:
"And then they arrived - the minister's family and all my relatives in a clamor of doorbells and rumpled Christmas packages."- Imagery.
"Robert grunted hello, and I pretended he was not worthy of existence."- Onomatopoeia.
Step-by-step explanation:
Literary devices are the different techniques that writers use in describing their characters or giving the details of the story. These devices enable better expressions of the ideas and emotions of the writers and their own styles of presenting the story.
In the first sentence, Amy Tan's description of the guests who arrived "in a clamor of doorbells and rumpled Christmas packages" uses imagery in describing them. It appeals to the sense of sight and sound, appealing to the readers' senses.
Moreover, the word "grunted" in the second sentence is an onomatopoeia, where the word is derived from the sound it produces.