Introducing them to my friends was a further trial to me. These relatives had such complicated names and there were so many of them, and their relationships to myself were so convoluted. There was my Tía Josefina, who was not really an aunt but a much older cousin. And her daughter, Aida Margarita, who was adopted, una hija de crianza. My uncle of affection, Tío José, brought my madrina Tía Amelia and her comadre Tía Pilar. My friends rarely had more than a “Mom and Dad” to introduce.

According to this passage, what causes Alvarez to dread introducing her friends to her family?