Cool site goodluck :) <a href="https://www.clearcloudservices.co.uk/about/wwwmediencecojp-30ec.pdf#push">mk.medience.co.jp</a>  For half-siblings, the extra risk of autism was smaller: younger half-siblings who shared a father with an older sibling had a 1.5-times greater risk of ASDs if their sibling also had one, a finding that could have been due to chance.