Both my parents were married previously and have children from those relationships. I am the only child they had together, so technically I am an only child but have half siblings. I have a half sister and brother on my dads side and a half brother on my mums side.
My mum is originally from Liverpool and moved south when she met my dad. Her son moved with her until he was old enough to move back to Liverpool as he was obviously happier there.
My dads two children live local to where my parents live now, where they and I grew up.
I remember always wanting another brother or sister when I was little, someone to grow up and play with. I think I was happy as an only child, I would be imaginative when playing with my toys and was happy to do so by myself. If I did grow up with siblings I wonder if we would have got on like a house on fire or squabbled constantly, as I have friends with both types of sibling relationship. I will never know.