Okay, so imagine you have a toy car. It belongs to you, right? You might say "This is my car" or "The car belongs to me." That's pretty simple.
Now let's say your friend has a toy car too. You might ask "Whose car is this?" to find out who it belongs to. Your friend might say "That's Sally's car" and you know it belongs to Sally.
But what if you want to talk about something that someone owns, like the color of their car? You might say "Sally's car is red" to show that it's her car that we're talking about.
That 's what the Saxon genitive is all about - showing ownership. Instead of saying "The car of Sally" like we might in other languages, we can just add an apostrophe and an s ('s) to the name to show that the car belongs to Sally: "Sally's car."
And it's not just used for things like toys or cars - we use the Saxon genitive all the time to talk about people's possessions or things that belong to them. So if your teacher says "That's Maria's pencil" or your mom says "That's Dad's jacket," you know they're using the Saxon genitive to show who owns the object.