Do you know about split personality?Have you seen anyone?

Yes, human character and nature is largely affected by the conditions they live in , the situations they face,these things make them suffer psychologically and they develop this disorder, which is known as split personality. I have not seen anyone in person but have seen films on such topic, but in films they show it in an exaggerated way.

Do people with split personiality know the have it?

Do people with split personalitys know they have different personailtys?