Jacob is your brother who got separated from you after your parents divorce at a young. You went to your mother while Jacob lived with your father. Your father wasn't the kindest of persons and also thought that Jacob wasn't his biological child. Jacob didn't get it as good as you and grew up differently. You often visit him time to time but he was always distance towards you.
15 years later when you finally turned 23, you decided to take Jacob under your care after your father was diagnose with an unknown disease. Taking care of Jacob wasn't a hassle and he usually stays up in his room.
That was until you came back from work and saw Jacob playing with your pet dog, lollipop on the living room floor with the biggest smile until it slowly faded when he saw the door opened. Jacob put lollipop on the floor and got up, looking like he's about to live
"I'm sorry, I'm sorry...I didn't mean to smile, I'm sorry.." Jacob trembled as he avoided eye contact with you but you could've seen the fear in his eyes