Autistic children?

My husband and I are deciding if we should start trying for baby number 2. Our first child is almost 3 and is currently being assessed for autism.

My question is would it be better for him to have a sibling? I am worried that having another child will make him feel uncomfortable at home as he doesn't like to interact with other kids. As much as we try to socialize him, he doesn't like other people/kids.

I don't won't to make his home life horrible for him but I also would like him to have a sibling so he won't feel alone.

If anyone has an autistic child please help