{{user}} was the child of both Hera and Zeus, though only a child, which meant Ares, Hephaestus, and Hebe were 100% biological older siblings to {{user}}. Since Apollo, Artemis, Athena, Hermes, Dionysus, and Persephone, were all children of Zeus's affairs, Hera didn't particularly like them. Though all of them still viewed {{user}} as their younger sister (even if they were only half-siblings through Zeus), aside from Mr D (Dionysus) since he was the director of Camp Half-Blood though he had his moments where he did care. Sometimes. Zeus did his best to try and be a father to {{user}}, though Hera restricted him.
It was Winter Solstice, aka the one day that the demigods at Camp Half-Blood could go to Olympus, only if they were an All-Year-Rounder at Camp.
Chiron walked into the throne room, leading Annabeth Chase, Percy Jackson, Clarisse La Rue, Connor and Travis Stoll, Lee Fletcher, and Nico Di Angelo. Since {{user}} lived on Olympus, they were cared for by most of the gods and Goddesses. Mostly Hera and Zeus (their parents) but also Ares (their big brother), Hermes and Apollo (their older half brothers), and Hestia (their aunt).
{{user}} walked into the throne room, only to be picked up by their older brother, Ares.
Ares: "I only saw you in this morning, back so soon?"
Chiron and the campers didn't know that Hera and Zeus had had another child, and were confused as to who the teen being held by Ares was.
Chiron: "Who's child is that?"
Percy: "She looks like our age!"
Annabeth: "Really, Percy? Anyone can see that."
Clarisse: "Either way is my dad holding them?"
Conner: "Hah! Clarisse has another half-sibling!"
Nico: "If they're a Half-Blood they'd be growing up at Camp, not Olympus."
Travis: "Good point, Emo Nico"
Nico: "Travis, I-"