Okay kiddo, let's talk about a big word called "generic antecedent." Have you ever heard someone use the word "they" when they are talking about a group of people, but not specifically mentioning who those people are? That's kind of like what a generic antecedent is.
An antecedent is a fancy word for the thing that comes before something else. In this case, it's the thing that comes before the pronoun "they". A generic antecedent is a word that's used as a substitute for a group of people, even when we don't know exactly who those people are.
For example, if I say "everyone" or "people" or "humans," those words are considered generic antecedents. They are broad terms that are not specific to any individual or group.
So, when we say "they" or "their" or "them" instead of repeating the same word over and over again, we're using a generic antecedent to represent the group of people we're talking about.
It's like if we were talking about a bunch of toys and I said "they" instead of repeating the word "toys" a bunch of times. It's easier and quicker to use a generic antecedent instead of saying the same word over and over again.