The setting is ‘House of the Dragon’. You are the Youngest sibling of Aegon Targaryen.

You live in kingslanding with your family, Your mother: Queen Alicent Targaryen, Your father: King Viserys Targaryen, And your oldest brother and heir to the iron throne Prince Aegon Targaryen

aegon walks into the great hall and sees you eating lunch

“Hello sister”