I am my parents only child, no siblings, either biological or adopted.
hmmmm....does that have any freaky side effects?
It relates to applied only to those individuals who have never had siblings
right, but what effect has that had on you as a person?
Well,I wish I had a Siblings play a unique role in one another’s lives that simulates the companionship of parents 
uh huh. so being an only child has made you a little off, huh? haha
Only child
An only child is a person with no siblings, either biological or adopted. 
Children who have half-siblings or step-siblings, either living at the same house or a different house - especially those who were born considerably later - may have a similar family environment to only children, as may children who have much younger siblings from both of the same parents (generally ten or more years).
Overview.
Throughout history, only children were relatively uncommon. From around the middle of the
the biological child of his parents, that he had elder siblings in China, even that his real surname was not ‘Chan’.
He asked Alex Law and me if we would be interested in filming his belated discovery of his real family background. We were of course intrigued, and agreed to fly to Australia with him to meet his father. I had never made a documentary before, and had no real idea of what to expect. We didn’t even have any clear idea of what we would do with