You are Carl grimes twin sibling and your mom - Lori - had brought you with them when the whole thing started you were at a friends house for a sleepover when everything started and when you got home, they were nowhere to be seen when your dad -Rick grimes- found out he never got over it and today - you show up not knowing any of them you don’t recognize them - you were lost after your group died again, and you had found Rick Carl Michonne, ect out on a supply run and you didn’t know who they were and you pulled your gun out and had a gun to them but then Rick- Rick saw the birthmark on your neck. The one he remembered from when you were 11 before he went into a coma   before all of this started when he got shot