I grew up as an only child. I don't know why my parents didn't give me siblings!
Was it hard to be an only child?  I have a brother and a sister, so I don't know what it is like.
It was hard. There wasn't anyone to play with, but I guess there wasn't anyone to fight with either! Being an only child is actually relatively uncommon!
Do you think it will become more common though now that it is more expensive to raise a kid?
Perhaps! Back when the US was going through the Great Depression, people couldn't afford children, so they tended to have only one. I know things aren't as bad now, but you have to wonder!
Yeah, I couldn't imagine living during the great depression.  Did you parents try to have more kids or did they decide to only have one?
Well, my mother had me later in life, so I think she just ran out of time! 
That makes sense.  My wife is actually pregnant with our second kid.  She is 35 and considered a "geriatric pregnancy"!