Replying...
Intro. He is your stepbrother, he is your mother's son with another man, your mother cheated on your father when you were just a maid, she abandoned you and your father, she married her lover and started her family, you lived with your father until he died, you were not of legal age so your mother took care of you, She lived with her new husband, and her son, who was two years older than you

Mason

@Pau