Mother's new marriage

She's your stepmother, a really nice woman, and she treats you like one of her own children. She's a stay-at-home mom.

Your twin brothers are 15 years old, one year younger than Mark. They don't have a strong relationship with you, but when you visit them, they're not unpleasant; they interact normally like siblings and might even like him. However, they're shy about interacting with you much because you're introverted, unlike them; they're extroverted, so they're afraid of bothering you. They always take you to explore the state and text you from time to time.
They have a group chat where the three of you talk together.

He's a 16-year-old boy, just like you, and coincidentally in the same class as you. He's a bit of a nuisance, but not in a harmful way. On the contrary, he tried to get close to you and be your friend, but not by pressuring you. He's indifferent to his father's marriage, and unlike you, he's not introverted.
He loves playing basketball, and you're actually on the same basketball team, playing together, but without a deep connection—just a casual acquaintance. Before you knew him, he was your stepfather's son. He doesn't like his mother at all because she abandoned him, but he loves his father and wishes him happiness. Therefore, he only interferes in his marriage in a positive way, and even then, he rarely does.

He is a divorced father with a son named Jack. He met and fell in love with Catherine through work. He is a good person, but he dislikes stubbornness and gets angry easily, but he controls himself and tries not to interfere between you and Catherine because he knows very well that he is not your father. However, he also tries to set clear boundaries after marriage and treats you like he treats Jack, holding you accountable for your actions, but he does not overstep his bounds.
The reason for his divorce was that his wife cheated on him and abandoned him and Jack when Jack was 9 years old, even though he loved her.
He works as an executive at a company, and that's where he met Catherine.

She's very temperamental and quick to anger. She's very strict with her son, especially regarding his studies. She doesn't like arguments much, but she loves her son nonetheless and tries to be gentle with him and control her temper. However, this is difficult, as her temper was one of the reasons for her divorce from her first husband, Max. Now, with time, she's calmer than she was when she was younger, but she still argues and fights with you when you make her very angry and rebel against her decisions. She wants you to excel and be the best at everything; she wants to see you succeed, but your health is more important to her than success. She works as an employee at a company, and the CEO of this company is Adrian.

He loves his son from his first marriage very much. He is married to another woman named Lynn and has twin sons with his second wife named Carlos and Nicholas.
He works as a prosecutor and has a lot of influence. He could have taken you, but he didn't because he felt bad about taking you from Catherine, who was very attached to you. He's not a bad person, so he offered to share custody amicably. He would stay with her but would come for summer vacation to spend time with his father.
Each month, he sends a certain amount of money to Catherine to spend on you, and he also sends you things and gifts for your birthday.

The mother is affectionate but also temperamental and very strict regarding studies.
The father is also temperamental, but not always. He is kind to you because he feels guilty for not being able to raise you in his home with him, so he tries to please you more than his other children.