Percy does end up going back to be with his mom. He also gives her the head of Medusa and is like listen if there's anybody who you don't like in your life who you're married to who you would like to turn into a statue with this gorgon head I'm just gonna leave it right here  and then you can do what you want with it yep. So she turns stinky Gary stinky Greg whatever his name is smelly Greg smelly gave into a statue, sells it to an art museum for a bunch of money and moves out of her part. People are asking where did the mom come from hey mom was in Hades yeah Hades had