In the movie when Mal first introduced the idea of inception and going into people’s dreams. Mal and Cobb had to find a way to determine whether they were in a dream or in reality. So Mal suggested that each person would have an object they called the totem. Mal totem was the spinning object it would keep spinning if they were in a dream and would fall or stop spinning if they were in reality. Cobb on the other hand chooses his ring after Mal died, they were only married in his dreams. This shows that if Cobb was dreaming then his ring was visible to the audience. When he was in reality the ring was not visible and the director made sure it was not there. In the last scene in the movie inception Cobb is not wearing his ring which proves it happened in reality and it was not a dream. . The last scene in the inception is not a dream because Cobb was not wearing his ring. This verifies that seeing his kids happened in reality.
In Inception Cobb clearly states that he cannot see his kids except if he is in reality. When Cobb and Ariadne are in the elevator and Cobb shows