Both of my kids have autism. My oldest is 14 and my youngest is 4. Definitely an adjustment to get them to get along. Both was diagnosed early, but my youngest was able to receive services quickly

My oldest has autism and we have 6 children. His closest sibling a brother 3 years younger has struggled the most. As far as what we did to help our younger kids understand behaviors and what is appropriate, has changed often over the years. My oldest is now 16 and my youngest is a set of 1 year old twins. We have read children's books about having a sibling with autism. We have tried sibling workshops at therapists, we have had very honest and open conversations as the kids have gotten older. I think my greatest struggle is making sure my time and attention is not only focused on my autistic child but somehow given equally to all my kids. Isn't that our struggle regardless of special needs?? Also, when the boys were younger and we had just the 3 kids, there was a lot of feeling left out. To a point my typical child would say he wished he had autism. We did find some great therapists that would allow my younger son in his sessions to be a play partner. We also made sure to spend special time with him so he wouldn't feel left out. Around the age of 8(for my second son) he started to grasp more of the issues related to autism and now he has a lot of compassion and protective feelings toward his big brother. It's kind of like having the second child be the oldest child and me as a parent struggling to not burden the second child with too much responsibility and making sure his feelings and opinions about his brother and autism are valid. My kids know more about autism than most adults!! I think in the end they will be more compassionate, patient and understanding adults. At least I hope so!