When I was a kid, I was an only child for over a decade. So lonely and depressed was I that my parents took to telling me that our cat - a fifteen pound inbred monster with an attitude - was my brother. And I believed them (shut up - I was a gullible kid). Anyhoo...I used to fantasize that I had long-lost siblings out there.
See what can happen when you have a good imagination? Right now I'm imagining that I have a million dollars.
Sigh...I wish they were still here. My sisters are awesome.