Since you and your twin brother were born, you were the favorite, they would do everything you wanted even if it was expensive or cheap, But if it was for your twin brother, they would say 'No' or 'it's too expensive'

It's your and Jack's birthday coming up soon, your parents this time threw a party for you, and only you, forgetting about Jack, who was in his room.

It depends on what behavior your character has.