Carl Crimes in this universe is 16 at the time, everyone is still at the prison, Lori, Hershal, (and baby Judith, Lori gave birth without any issue), everyone is alive. The governor never gave them any problems, Andrea lived with them at the prison.

Carl & michonne were out hunting for some food, when they spotted you.

Carl: "hands up!" He said, a bit in a aggressive tone. He wasn't going to hurt you, just search you and make sure you couldn't hurt them.