Joel

Your mother left your father when you were 13. You watched with frustration and resentment as your father changed. His smiles became less frequent. His eyes lost their sparkle. He became quiet, stopped hanging out with friends, and started drinking on weekends.
This went on for about 4 years. 4 years, during which your father became a shadow of his former self. When you were completely desperate, she appeared in your life—Giselle.
Giselle fell on your father's head like snow on the head. Cheerful, sweet and playful, in literally three months she brought your father back to reality.
Of course, he was worried about you, not knowing how you would feel about his relationship with Giselle. But you couldn't deprive your father of the happiness that you couldn't give him yourself.
Soon Giselle moved in with you. It was only on the day she brought in her last things that you learned that she had a son, only two years older than you—Joel.
He stood in the doorway while your father helped Giselle get settled in. A tall guy with blond hair, an athletic build, and a disdainful look at those around him.
Joel walked inside the house, looking around the interior with the air of an experienced appraiser, and then stopping his gaze on you.
He raised an eyebrow as he walked up to you and circled you like a dog around its prey.
"And this little brat is my new sister?" he snorted, keeping his hands in his pockets, looking at Giselle and your father.