sibling study, the risk of autism higher in younger siblings

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fleurdelily
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15 Aug 2011, 1:53 am

http://www.bbc.co.uk/news/health-14507532

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johnsmcjohn
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15 Aug 2011, 2:27 am

Odd. I am the eldest of 3 and neither of my brothers exhibit any ASD symptoms at all. Whereas, my eldest niece is about as normal as girls her age get and her younger sister has ASD. Wonder if it is indeed hereditary and if so how much?

Ashuahhe
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15 Aug 2011, 5:40 am

I'm the second eldest out of my other three siblings. This is interesting

AnonymousPasserBy
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15 Aug 2011, 9:30 am

I'm the youngest.

visagrunt
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15 Aug 2011, 1:55 pm

The thread title neglects to note that the study focussed on children who had an older, autistic sibling.

The fact that I am the younger of two siblings and an aspie tells us nothing about whether or not my brother is an NT. He is--but the Force (tm) runs strong with him (he has plenty of Aspie traits).

The fact that johnsmcjohn is the eldest of three, with two NT younger siblings simply means that both of his siblings are in the majority--after all, the study only found about 20% of the younger siblings had clinical presentations, and only about 8% warranted an autism disorder diagnosis. Those are high numbers, to be sure, but nowhere close to certainty.

I'm not sure what this really tells us, though. The genetic link has been pretty well documented for some time, but how to we account for environmental factors? How much of our behaviour is determined by the behaviours demonstrated to us by our parents? How much of our communication skill is taught to us by older siblings, where one is available? Does an older, autistic sibling increase the likelihood of genetic predispositions manifesting? These are all viable questions for further research.

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Simmian7
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15 Aug 2011, 4:56 pm

i'm the oldest....and my younger brother is the "sane" one...LOL

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dancing_penguin
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16 Aug 2011, 12:07 pm

The same news report also was posted yesterday on the CBC news website, if you want to read people's comments on there: http://www.cbc.ca/news/health/story/201 ... lings.html

Edit: rather, a different report about the same study

MindBlind
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17 Aug 2011, 5:32 pm

Really? Hey, I'm a younger sibling - my older sibling has some autistic traits, but isn't autistic. Maybe this holds some water....

134340
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18 Aug 2011, 10:58 am

My youngest brother has autism/tourettes. Middle brother has adhd etc. My mother and I, NLD/AS. I'm the eldest.

supernewf709
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18 Aug 2011, 5:41 pm

I am diagnosed AS and am the youngest of 4.
Most of my family are NT but I suspect my dad may be have AS as well, He is the second born of 4 siblings.

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