I am the Sibling of an Autistic Brother - I am Worried About Having My Own Children

I am the sibling of an autistic brother who I love dearly. I am however very concerned that I may potentially carry genes which I may pass onto any future children of my own. I understand how difficult it is for my brother to deal with his disability on a daily basis and how hard that has been for my parents. 

Does anyone know any other siblings who have gone on to have children of their own? Have you seen a linkage in genetics? The information in the public domain suggests that autism is predominantly genetic with some environmental factors. I have already ruled out Fragile X. 

All the best.