It turns out that the reason Poseidon had asked if he was getting another grandchild was because it turned out Annabeth was pregnant again.
About 9 months later, she gave birth to a beautiful baby girl named Isabella Thalia Rachel Jackson. She looked like a female version of daddy in every single way.
Carly loved her new baby sister. Luke was a little less than thrilled. Mainly because since his room was right next to Bella's, she always woke him up in the middle of the night with her crying.
"She's a baby Luke; you were once just like that." Percy told his son when he complained to him about it.
Once Bella had stopped nursing and Annabeth's maternity leave was over, Percy started taking Bella to work with him and set up a little play pen in his very large office, along with a pop up crib.
"Seriously mom, can't we Carly in a different so she doesn't wake me up at night?" Luke begged his mom for the 100th time.
"No Luke, Bella is staying in her current room, so suck it up and deal with it. Now, your father and I are going out to charity event for someone from your father's work. We'll be back in a few hours. Carly, you're in charge. You know what to do if Bella gets fussy." Annabeth said as her husband came from their room wearing one of his only dress suits and it matched Annabeth's black dress.
"Come on, and Luke, when we get home, we better not find out that you sent Bella to live in Australia." Percy said.
"Aw man." Luke pouted as his parents left.
Carly had just finished giving her baby sister a bottle and was currently burping her.
"You know, you could help me out?" Carly said
"I could, if I cared about Bella." Luke said.
"Don't listen to your big mean brother. He loves you." Carly said in baby talk to Bella.
Bella just started crying.
"Luke apologize." Carly scolded her little brother.
"Fine. Bella, I'm sorry I said I don't care about you." Luke said sarcastically.
Bella stopped crying, just long enough for Carly to sniff her diaper.
"I think someone needs a diaper change, and then a bath and then it's off to bed." Carly said, taking their sister into her room to change her.
After Bella was down for the night, Carly walked out to the living room where she found Luke watching TV and eating popcorn.
"Okay, what was that about? Why do you still not like Bella? She loves you." Carly said, sitting down on the couch and took a handful of popcorn.
"It's stupid." Luke said
"No it's not." Carly said
"Fine. I'm jealous alright. Ever since Bella was born, mom and dad have been too occupied with her. It's like I don't even exist." Luke said.
"How do you think I felt when you were born? I know it's tough, but it's only because Bella's new and small. Trust me, as she gets older, mom and dad will stop paying as much attention to her. But for now, be happy you've got a little sister." Carly said
"I never thought about like that." Luke said
"Well I'm gonna go do some sword practice in the gym (After Carly got her sword, Percy had turned gotten Athena to create a secret arena for them to train in)." Carly said, pulling her pen, which she had decided to call Icarun, and headed towards the arena.