Greetings Stolen,
Thank you for your reply. I had a more or less similar experience to you. I was aware of a younger girl. I didn't know what to do. The best was when she had knowledge that I didn't have. When I checked it out, I thought, wow, something's goin' on. When I would journal "they" would express themselves. I initially thought it was just my imagination and that everyone's imagination worked like this.
You are actually starting to stumble into the "light", hun. (lol)

As time goes on, the process takes on a life of it's own and you will be able to go with "the flow" of it more. I would suggest you trust yourself with how you want to communicate with the dissociated parts of yourself.
I would suggest that you and your therapist read Colin Ross' book on DID. Other good information can be found in books written by Putnam and Kluft.
The best advice that I think I can give you is to trust that your psyche knows it way home. You need a therapist who understands this and who can provide you with an arena in which you can heal.
By all means communicate with your alters. As you start to do this, it may make things start to shift. Some alters may hear you. Others may not. Some alters communicate with each other, but not with you. I found that as the alters became safe and got used to being out you will learn alot more about them and they will go with the process too. It will take awhile for all of you to realize and accept that you are all on the same team and that each one brings something valuable to you that enables you to have a much richer and stronger sense of yourself.
Initially, I found it a relief. At last I had an explanation and a diagnosis (did) that actually described how I experienced being in the world. It also became somewhat overwhelming too. I wanted to fix things up right away. I have woken up in the middle of the night b/c of alters arguing in my head. Yes, there are peculiar features to this disorder. But it also goes to show you that there's
alot we still don't understand about the human psyche. In the 1950s DID was considered to be extremely rare. Incest was also considered to extremely rare. I wonder what they'll be saying about DID in another 50 years?
It's taken me a long time to get to know my alters. Some have names. Others are known by what they do (eg the cleaner, the student,the protector, etc) And there are alters who don't have names and don't know how old they are. My T and I can usually get a rough idea by how they speak and what they speak about as to what their age is approximately.
At first their name and age, etc. seemed to be so important. As the years have past and considerable integration has occurred, this has become much more ordinary and way less anxiety provoking.
I've said more than enough for one post!
Bye for now.