hey! I'm not an only child, I have 3 siblings, but I've always wondered about only children and why they're so weird??
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
character, Toressani stated: "I see them as the same blank palette, and they all have different colors to them. The original Zoe will always only be the original Zoe, the avatar will only be the avatar, and so forth. They're all the same basis, but they're all very different, in their own way...The avatar is based on the Zoe original...They're all equally the same. It's hard to play the avatar when I'm in the robot because that's very weird.