In recent memory and because the show sanitized his upbringing, Percy gets treated like he had an idyllic childhood. And it drives me crazy. Yes, his mom is actually the only good parent in the entire series and everyone else has incredibly messed up origins. But he, too, had an extremely traumatic childhood and you can see such clear evidence of how it shaped him.
I think of that part from TTC when he meets Annabeth’s stepmom and expects her to like turn into a raving lunatic at the mention of her name and is surprised when she doesn’t. And it’s easy, I feel, to read this in retrospect as Percy just not understanding the nuances of bad parental relationships. But I think this is what it actually is: Percy’s experience with a bad stepparent is Gabe. And that’s how Gabe always reacted at the mention of Percy’s name. And Gabe would have left him to rot without any question or remorse. So of course that’s what he expects from the stepparent Annabeth has been complaining about as long as he’s known her, and she deemed bad enough to run away from.
And yes, compared to Luke and Thalia and Annabeth, Percy is somewhat better off solely because of Sally. Except he, too, was deadly serious when he said he’d rather live on the streets than live with Gabe, and if not for camp that would have been his only option at this point in his life—the same as it was for them. Percy truly CAN relate to the feeling of camp being his only safe haven because this is also true for him. Percy probing Thalia about her history with her mom is not a kid who comes from a stable home trying to relate to her and failing: it’s a kid who grew up sharing living space with an alcoholic, and is able to tell at the age of 12 years old “when an adult has been hitting the happy juice.” And this is of course not even to talk about his constant awareness of money and his mother working odd jobs just to put food on the table—experiences that Thalia, Luke, and Annabeth don’t have. So I think it is just so unfair to view him in retrospect as the kid who is so privileged that he can’t understand trauma rather than what he actually is: a kid who was only ever one bad day away from being in just as bad of circumstances as any one of the other demigods, and who at points in his life, actually was in their circumstances. When Percy meets May Castellan he is not just reflecting on how bad Luke’s life sucked, he has experience and trauma of his own, and he feels a heavy sense of “how easily this could have been me.”
Percy being not outside of the problem, but inside it, is fundamental to the series. He’s not just championing Luke’s cause: it’s also his own! Because who is more exploited by the Olympians than Percy Jackson? This is a kid who has almost been put down like a dog by them ! They took a vote on it in front of him!
Leo and Frank and Hazel’s moms are actually dead and they stayed dead. But Percy watched the Minotaur squeeze his mom to death right in front of his eyes and had to process her death and blamed himself for his failure! Of course he is going to relate to them on a fundamental level, and again, he was so very close from having been in exactly Leo’s situation.
I hate the Percy and Annabeth dynamic the show is setting up and more recent works have established, with Annabeth being integrated into Percy’s happy and stable home life. That’s not where Percy came from. They are both kids who come from messy, painful experiences and and they see likeness in each other. He’s actually needier than she is when they first meet!