Hi Czczcz, I have done this with one of my cousins. After my diagnosis, I began exploring my family and discovering the autistic traits in it. Then I realized---my cousin!! ! He is ten years older than me. I discussed this with my mother (it's her side of the family) about telling him. She said, "Go for it, but be careful." One evening I got up the nerve to approach him with it on the phone (he lives two hours away and we rarely see each other). Here is how I did it and what he said:
1. I told him I had been recently diagnosed with Asperger's.
2. I explained that Asperger's was a form of high functioning autism that was often noted for great accomplishments due to special intense interests (I wanted to show Asperger's for its positives---although I did state its social challenges and sensory issues and literal thinking and...---but I stressed the positives).
3. Then I began bumbling around on the phone---then I said something like, "Since Asperger's is a form of autism, and autism is considered by many experts to be genetic, I have been searching for the gene in our family...and since we are descended from Thomas Jefferson, it is interesting that he is considered to have had Asperger's...well...you remind me a lot of him in how you were always building things and stuff...have you ever considered you might have Asperger's?"
4. Then there was a little silence. He said, "I never thought about it, but my wife has worked with children who have Asperger's...and funny you mention this because there are certain things that I guess I can see." Then he went on to discuss Asperger's traits in his mother, grandmother, and uncle.
5. Before finishing the talk with him, he said he would mention it to his wife and get back with me on it. He never got back with me on it.
I am glad I discussed this with him. In our conversation I think I sensed that he was uncomfortable with the conversation. But since I misread people, he may have been fine with it. I have other cousins who have these traits as well, but I have not approached them yet. The one cousin I most want to approach is the sister of a deceased cousin of mine who spent his life in a psychiatric hospital for what I feel would today be diagnosed as autism. Back in those days they just called it "crazy." I want to talk to her about him, but this would be a bit more tedious since she and her parents more or less wrote him out of their life.
I voted that you should discuss this with your cousin---but use caution. Good luck.
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"My journey has just begun."