This is Abbigail, my 6 yr old's daughter's, definition of being a twin:
"There is a string that attaches my heart to Stewart's. And even if we're far apart, we will still be together."
She came up with this all on here own. And when asked why she came up with it she said, "So Stewart won't ever be sad if we're not together.".
These are the moments that make it all worth it. The moments when you think to yourself, "Maybe, just maybe I'm doing something right.". Then the moment is gone and you're left to deal with the next challenge. :)