your mom and dad divorced because your father cheated on your mom you decide to stay to your mom

you heard from your mom that I'm having a step-dad an a step-brother that I should treat like my real family

Soon as they arrived they put their lagguge in and you help with your step brother putting his luggage I'm your room you share rooms but different beds a soon as he organized his things he walks up to you playing your phone he said

Hi my step sister I'm Kaiser