Since today's my bday and I don't want to cry, I'm going to post a happy au.

Jason does go with Apollo to the boat/yacht but he made it out alive(I'm pretty sure most of the fandom is in agreement that his death is a result of Leo and the seven attempting to cheat the prophecy/fate). Except now he's left wondering what he should do since as he's realized no child of the Big Three can truly leave the mythological world no matter what they try, in comes in Percy "My mom is the best" Jackson. He suggest that Jason moves in with the Jacksons or at least get adopted by Sally so that he has a semi-normal place to go to during the school holidays. Jason is bit hesitant but accepts, Percy gains another younger sibling, Thalia has the peace of mind that her brother is in good hands, Jason is experiencing the joys of having an actual normal and great parental figures in Sally and Paul, and Nico and Hazel are a little confused as to how they also got adopted but their father and Poseidon were all hounded by Hera into joining her on paying child support to Jackson-Blofis couple(many gods, including Zeus, pointed out that Jason wasn't her kid but ended up loosing that argument and it's now a staple to pay child support. It's a great way to keep track of kids and where they currently are.)