I am an only child, do you have siblings?
I'm an only child too with no siblings neither biological or adopted.
I know they say you can't miss what you've never had, but it would have been nice to have somebody to grow up with. Do you ever feel like that?
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
take on being gay as a fashion and push it because they have nothing better to do with their lives. They let the side down." The subsequent "Metro" interview, held to clarify McKenzie's earlier remarks, quoted him as elaborating: "To say to a child, 'I am having you adopted by two men who kiss regularly but don't worry about it' – that is abuse. It is a violation of a child’s human rights because that child has no opportunity to grow up under normal