Sibling has Autism, First Child’s Chance You've asked the million dollar question. It does tend to run in some families. Yes, there might be a chance which you already know, how much of a chance is anyone's quess. Maybe just slightly more than in the average population. Just going from memory here but i think you generally have 99.9% chance of everything being fine with a child but in the case of autism you might have say a 95% chance of everything being fine. The odds are still well & truly on your side. I can't answer the question, but I have the same concern.  I have autism, and I worry about my older sister's future children.  She'll be having them in the next few years.  If they do have some form of autism, I can't help but feel like it's my fault.SuperTrouper, of course it won't be your fault - don't blame yourself. Something is only your fault if you consciously make it happen & you didn't consciously give yourself autism. It just happened. Try not to feel like you are responsible in any way. There is a good chance still that your sister's children will be typical little terrors and if not, at least they will have you as an aunt/uncle who will understand and love them just as they are. idk...jury is on this mixed one. u have a higher than reg chance,in my opinion Hi everyone! I just had a quick question about heredity in relation to autism. My younger brother has a very mild form of autism and lives a fairly normal life.  My question is that if I were to have a child in the future (I am 26, turning 27 in February, male, first child) what are the chances that my child will get autism? I understand that the age of the father also influences the chances, but I just wanted to know if there is an increased chance for me, since my younger brother has it. Thank you! One thing you could do is visit with a genetic counselor.  You can find out quite easily if developmental delays are truly hereditary by having a couple of blood tests.  Genetics accounts for somewhere between 4-10 % of autism (depending on which study you pick up and who you talk to); the remainder of cases have indeterminate causes or mixed causes.  So knowing (or not) whether you have a genetic blip or carry a trait that could cause autism, while important, may not put your mind 100 % at ease.  But it could help.
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