I have not kept up with this thread or the general airing of these issues on MN. Partly due to limited time but also because I find it confusing. On the one hand I don't see anything wrong with someone deciding they don't want to have a child with any SN that can be detected before birth whether, like me, they already know what is like, or not. But I also agree that there is a lot of misinformation, fear and prejudice. It is not OK for someone to be knowingly insensitive and disrespectful.
When it comes to the issue of how having child with SN affects siblings, that is something I DO know about. It is complicated as most people look at it as a child with SN being included in a family. That is not always the case and, as many of you know, for many years I had ONLY a child with severe SN, we did not have a family as such and that is a VERY different and difficult, heartbreaking experience. Then there is the issue of how many siblings there are, age gaps and whether they are older or younger. These things all make a difference to how the situation affects siblings and a family.
I know two families very well where there is one sibling with SN and one NT. In these two cases the NT child HATES the sibling with SN, not just because of their needs coming first etc (see Coming Down the Mountain) but because they are often verbally and physically threatened. Then I know other families with two siblings close in age where the NT sibling adores their brother/sister, is proud of them and can't do enough for them.......
Having grown up myself with a sister with AS (although it didn't have a name then) I really fear this situation as it definitely spoilt my childhood to some extent and, even now, is the biggest obstacle in my relationship with my mother. Yes, we can say that if AS had been known and my sister had a dx it would have been different, but I don't know so much, maybe a bit, but she still always came first, was always treated as "special" (although we didn't understand that word in today's terms but it amounts to the same thing).
Having had only DS for 7.5 years and then, fairly unexpectedly, having DD, I can see how it already affects her childhood. She does love him deeply and understands him in her own way. But she can't have friends round to play if he is at home, we can't go off to the park etc after school as we have to be back for him and we can't go with him, she can't use the bathroom half the time because he has messed it up, she gets woken up at all hours by him making a noise and many, many more things that happen because of his SN. SHe loves him now, but I don't want to get to the point where she hates him. She will not have any other siblings (but a kitten for Xmas!) and we do not have lots of family nearby. No, she doesn't know any different, it is her reality, but at 4 years old she already knows that her home life and family are different to those of her friends. I do take her to SN activities where siblings are welcome, but they are few and far between. I will continue to do so and hope she starts to bond with some of the other siblings AND the other children with SN, but her support network is minimal.