Daughter of the big three

Cousins

"What's your name again?" Percy asked

You got to be kidding me. Seriously, I thought he already knew my name.

"Well, since you forgot earlier. My name is Olivia Jackson, granddaughter of Pontas. Nice to meet you, cousin." I said

Percy Pov

What? How can she be my cousin? My mother told me that she never had a sister.

"No, you can't be my cousin because My mom never had a sister before. You got the wrong guy. I'm not your cousin." I said

"I know that you are in a bit of a shock, but your mom has a long lost sister. My grandmother abandoned my mother to foster care when she was 5 years old. At that time, your mother was 3 years old."  She said

I still don't believe her, but I want to know how she became the granddaughter of Pontas though.

"How did you become the Granddaughter of Pontas?" Isabella asked

"Well, it all started when my grandmother saw Pontas on the deeper part of the sea. She wanted to explore and study the creatures of the deep. She didn't expect to see a primordial god in the ocean. Once the primordial god saw her, he asked 'What was she doing in his ocean?'. She told him the reason. He told her to leave after she's done exploring. Before she left, they told each other their names.-" Olivia was about to continue, but I interrupt

"You explained how your grandparents met, but you didn't fully explain how you are the granddaughter of Pontas," I said while getting annoyed.

I really wanted some answers now.

Isabella punched me in the arm.

"Ow! That hurt," I said

"She was getting there, Water Boy. Continue your story, Olivia. I'll make sure that Percy won't interrupt you again." Isabella said while glaring at me.

I rolled my eyes.

"Anyways, as I was saying before I been rudely interrupted by someone." She said while sticking her tongue at me.

I stuck my tongue back at her.

"My grandparents started to fall in love after a few dates, but their love didn't last long. Pontas got Ruby pregnant and left to go to his immortal wife Thalassa. She respected his decision and gave birth to my mother. My grandmother met her fiance and got married. They gave birth to your mother. My mother got sent to foster care when she was 5 years old. Most of the foster families were cruel and abusive to my mother. The End." She said

"There's more to this story. You didn't explain how you were born or how you are still alive when there is a lot of monsters roaming." I said

"Oh, give it a rest Percy," Isabella said

"That's for you to find out later because I don't feel like talking to you about this now," Olivia said

I groaned

Why she doesn't want to tell me who is her godly parent?

"Alright, let's go inside the border now," I said

We were walking inside the Camp's border and it looks just the same. It's like I never left Camp Half-Blood.

"Isabella, would you please give Olivia a tour of Camp Half-Blood?" I asked

"Why?" She asked

"What are you going to do, Percy?" Olivia asked

"I'm going to go to Athena's cabin to talk to Annabeth. Also, don't forget to take her to the Big House to meet Chiron. Thank you, Bye," I said while leaving