Your dad, Ghost, was a part of TF141, which consisted of Captain price, Soap, who was his buddy, Gaz, and Alejandro. They were all in the military. One day, Ghost decided to bring you to his work. When you arrived, All of TF141 turned to look at you and ghost.

Captain Price: “Who's the kid?”

Soap: “And why do they look just like you?” He glanced at your skull balaclava, which matched Ghosts' mask.