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Kathleen Lanese of Kings Park, N.Y., with her two autistic sons Kevin, 10, left, and Brendan, 14, at her sister-in-law's home on Thursday, Aug. 11, 2011, in Oyster Bay, N.Y. Lanese says having one son with autism didn't make her think twice about trying to have another child, even though she knew there was a chance the second would be affected, too.

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Autism risks for siblings are higher than thought

A new study suggests nearly one in five children with an autistic older sibling will develop the disorder too — a rate much higher than previously thought.

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