I've always been interested in the idea of being an only child or having no siblings, since I have a brother.
Yes it must be weir having no siblings, I've got 3.  They are supposed to be spoiled, but it is no sually the case of those I know
I also never really thought about the fact that those who have had siblings before but don't anymore are technically not only children.
What do you mean?
Well say someone had a sibling but then he, god forbid, died, he isn't an only child because he knows what having a sibling is like.
Ok, yes that would  be awful in many ways.  What do you believe is characteristic of single child' personality?
Probably a bit anti-social and quiet. Though throughout history, only children were uncommon.
But maybe smarter than others or at least more cognitive developed? True that I don't many single children.
Maybe, I'm not too sure. Though from the middle of the 20th century, birth rates have dropped a lot and therefore there are more only children recently.
Do you know what is the average of children in a household?