Its very interesting to read others views on this, as I have very few friends who are only children themselves. Virtually all of my friends have siblings.
What I didnt mention this morning on my post, is that one of the reasons I am an only child, is that I was adopted. Not that this was ever an issue to me as a child, it was just a unique part of me that made me special and I never had hang ups about it.
It has brought problems though as I have got older. My parents were always my parents, and I never thought of them as anything else. I have never had any real urge to find my birth mother. I know the circumstances of my birth, and understand her reasons. Or thought I did until just before my mum died. I did a bit of searching on the internet, as you do.. and found out I had 2 half brothers, born before me, and that really threw me. I have no idea where they are and am sure they know nothing at all about me, so I am still an only child.
My dad was an only, and my mum had one sister, who was living in S Africa when I was growing up, so I never knew my cousins until I was 8 and they came back to England. Even then they lived 200 miles away, so we only saw each other a couple of times a year. I dont have any contact with them now, and feel that, as I was adopted, they dont see me as a blood relative anyway. I have no contact with any of my fathers family (his cousins) as again, they dont see me as being a part of the real family.
I did only cover the negative parts of being an only this morning. I am sure it had its positive sides too.. I think it helped me to be more confident in life, because I had no to stick up for me, I had to do it for myself. I spent more time with adults, so find it easy to converse with them. I do think you grow up quicker as an only child.
I dont think anyone is being reasonable or unreasonable to only have one. For many people, it isnt a matter of choice, and I appreciate that, but I did want to express my personal perspective on how it felt to me growing up as an only child, and how I still feel about it even now at 40.