Hi. I am an only child. You?
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
attended St Bede's College Mentone, listening to their father's classic rock records from the 1960s and 1970s.
However, according to Nic, it was Australian band You Am I who had the biggest influence on Jet's developing musical tastes:""Hi Fi Way" was the most important album of my generation. ... I think everyone our age, who played guitar, played You Am I songs for the first time in front of their school assembly. ... That was the record that made you realise you could be in an Australian