I'm an only child, which means I have no siblings. What about you?
oh interesting! Do you like it? I have a brother!
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
I quite expect that you will. I know what "Ops." over Germany means, and I have no illusions about it. By my own calculations the average lifespan of an aircrew is twenty ops(operations). and we have 30 to do in our first tour. I'm Writing this for two reasons. One to tell you how I would like my money to be spent that I have left behind me; two to tell you how I feel about meeting my Maker. 1. I intended as you know,