oh HELL NO.......I"m way to wrapped up in myself to even THINK of there being a twin, etc......EGADS just the thought horrifies me!
I'm glad I'm the youngest of two, though.....BUT my brother is six years older than me so we didn't have much in common when I was growing up...........I've read that 6 or more years difference in age between siblings is considered an 'only child', & I can see why.
but we get along very well so that's all that matters, I guess............