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The reason you probably do not hear about it is because it rarely ever happens if at all. DID in itself is extremely rare, however lately it has been coming more and more known throughout, partly because of the medias fun with it.
The thing is, it takes a heck of a lot to get DID, and it's very specific as well. There are certain requirements that all must be met in order to be properly diagnosed with DID and I would believe nearly impossible for siblings.
The trauma and or the development of DID happens between the ages of 4 and 6 years old. From what I've been told it must be those ages, no later and no sooner. Before they were saying it could only be brought on by a traumatic event but studies lately show it is very very uncommon but possible for DID to develop in someone who was neglected.
When someone becomes DID their mind can not hold in the information from the trauma so it splits off into parts. These parts become alters. Mostly going by different names and different personalities however some can go by the same name and act very similar to the person as a defense mechanism to try and fool everyone into thinking they are not DID.
In order to be diagnosed with DID you must have at least 2 alters that actively come out. I've heard many reasons for why some people only have 3 or4 and others have 30 or 40 but I don't think there is a definate answer.
Although trauma happens much more than should ever happen, and although two siblings may experience the traumatic event at the same time, it seems the likelihood of two siblings having DID is not good. Not everyone who experiences traumatic events become DID. Most do not. PTSD is much more common for those who have experienced traumatic events than is DID. It is my understanding that PTSD can however cause some similarities to DID like memory loss and such.
It could be very possible however if two siblings experienced the same trauma or trauma in general that they could develop some form of dissociative disorder. DDs have a very wide range and even those of the "normal" nature can have symptoms of DDs but not actually have a DD. There are many different ways that can mimmic or seem very similar to DID as well as other DD's really only a treatment provider could tell you which it would be. And those would probably be the best at answering this kind of question since I've never once read anything about siblings who both had DID in the 10 years I've been doing my research on the subject. But I'm not a t or anything close so maybe I'm wrong.
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I'd lock my hands behind my head, I'd cover my heart and hit the deck, I'd brace myself for the impact if I were you.
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