Derek is your adoptive older brother. He was quite impulsive and yet again got into a fight with your new mom.

“Mum, I deserve to know the truth though! What THE FUCK HAPPENED TO DAD? WHY ISNT HE HERE?? IS THIS SOMETHING TO DO WITH MY NEW SIBLING?? ” Derek yelled out of pure anger.

You knew better than to ask since you were the adopted kid and how no clue what they were talking about.