Alright I've gotten two very good questions and I'm going to answer them. Anya used to ask Morpheus to help her sleep and Morpheus had a portion of his essence trapped at his home.

Thank you and keep the votes and comments coming.

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Lytoria

I can't wait to meet my dad. I've been waiting my whole life for this. When will Percy get here. I can't wait. I squealed. What will they be like? will they like me? what if they don't?

Anya

Percy got into a spot of trouble with Chimera. He defeated him with ease. I made sure no monsters would cross his path. I need Percy safe. Erik will meet his children.

Percy

"Do you guys find it really odd that we've only been attacked by the Chimera and nothing else?" I asked. 

"I think someone is protecting us. Hear that?" Nico said. I listened. 

"That sounds like someone fighting a monster singlehandedly." Annabeth said. We looked over the edge. 

"Come on Deusy I know you can do better than that." A girl with black hair and tan skin like mine said. 

"Spawn of Poseidon you can't beat me." Medusa said. The girl sliced off her head. 

"Please I defeated a Kindly one in a minute." She said. She shimmered and disappeared. 

"You don't think she could be......." I asked. 

"Very probable. Wait she dropped something. Nico or Percy get it." Piper said. I vapor traveled and saw that there was a note. I went back.

My little Perseus,

I'm sorry that we haven't met in person but the key inclosed will point the way and identify you as my son. I love you and your sister says hi.

May the fates be with you,

Your mother and Lytoria

"That was your mom. Dude she kicks butt and looks too young to your mom....ow!" Leo said as another note fell out of the sky. 

"By the way your father and I are immortal. And Leo thank you. Piper and Leo I have two friends that are your siblings. One made my engagement ring. Yes Percy your father and I weren't married. Ask Triton. Blessing of Athena." Annabeth read aloud. 

"The key is pointing toward the Paris opera house." Frank said. 

"Let's go." I said.

Eventually we found our way there. Having Frank and Hazel ask directions got us no where. The key pointed us to a mirror. 

"Well that was a waste." Jason said. 

"No it wasn't. I think I got it." Annabeth said opening the mirror. The passage was dark and creepy. 

"Leo light." I said. Leo lit his hands.

Erik

I was kneeling next to the spot where my beloved Anya died. 

"Ow. Percy watch where you're going." I heard someone say. 

"Leo we need a brighter light Piper is tripping." Another voice said. 

"Ooh a gold bar." Someone else said. 

"Leo don't touch that!" Another person said. 

"Wait the key is pointing that way." The second voice said. 

"Yeah there is an aura similar to mine down there." A fifth voice said. 

"Well come on Seaweed Brain. Who are you?" a sixth voice said. 

"I'm Percy's sister, Lytoria." The seventh said. 

"Wow she is hot Percy." The third voice said. 

"Leo." The first and sixth said. A group of different people walked down the steps. There was a pale boy with black hair, a blond boy with blue eyes, a blond girl with gray eyes, a pale girl with black hair and dark eyes, a boy with a young looking face, a girl who was staring at a ruby that appeared, a boy with his hands on fire, a girl with a dagger in her hand, and a boy who looked like Anya. 

"That has to be him. Mom only described him but he has to be dad. Who else lives in the opera house?" the pale girl said, her face split into a grin.

Percy

"I don't have any children. My fiancée and I were going to have one but she and the baby died in a fire." He said. 

"That's what you think." A woman stepped out of the shadows. 

"Anya? but how?" he said. 

"Erik, Triton made me leave. Oceanus was trying to get me to marry him. Percy and Lytoria are both your children." My mom said. 

"You have a lot of explaining to do but first can you introduce yourselves?" A Greek girl with black hair said. 

"Go ahead Seaweed Brain." Annabeth said. 

"I'm Perseus Jackson." I said. 

"I'm Annabeth Chase daughter of Athena." She said. 

"Piper McLean daughter of Aphrodite, Charmspeaker." She said. 

"Jason Grace son of Jupiter." He said. 

"Frank Zhang son of Mars legacy of Neptune, shapeshifter." He said. 

"Nico Di Angelo son of Hades." He said. 

"Hazel Levesque daughter of Pluto." She said. My dad stiffened at this. 

"Leo Valdez son of Hephaestus fire user." He said. 

"Lytoria Destler legacy of Poseidon, Apollo Hecate and Hades." She said.

"I'm Victoria Jackson, daughter of Hephaestus legacy of Aphrodite and Poseidon." The red head said. 

"I'm Alyssa Grendera daughter of Aphrodite legacy of Dionysus." She said. 

"Erik Destler son of Hades legacy of Apollo and Hecate." Dad said.