How many children do you have?

I have 2 sons. My oldest child is five and was diagnosed with autism shortly before his fourth birthday. My youngest son is 2 1/2 and has been closely followed by early intervention as a precaution but has shown no signs of Autism.
My husband and I would like another child but I know the statistics of having another child with Autism are higher.
Our two son's do get along great, my younger son has really helped my older son and although my older son isn't social with other children he does have a lot of fun with his younger brother; they spend hours playing and laughing together. Would another child upset this good relationship they share or would more siblings be a good thing?
I would love to hear from other parents about your children, how many you have and the relationships they share.
Many thanks for taking time to read.
Jo

[missyaftc]

The best thing you can do is give loves and huggs and your boys will be fine.
I was adopted and at the age five overheard they were going to take me back.
I was extreamly quiet very cute bute mute. All these years I jsut wanted the huggs and I love you's.
Your boys are darling.
"One day at a time"
Missy