I know I might be giving away my age here, but for nine long years I didn't have a sister.
For those nine long years, the closest thing I had to a sister was three girl cousins who lived a long, long way away. I didn't get to see these cousins often enough, so when I was in grade two (7 years old), I decided that I was going to save enough money to buy my own plane ticket to go and see these cousins.
After six months of depositing quarters in my piggy bank (I'm sure I was oblivious to exactly how many quarters it would take) my parents took pity on me and purchased my plane ticket.
I got to spend one glorious week surrounded by these three beautiful cousins who were all my age and who were the closest I thought I would ever get to having real sisters. Hanging out with them I experienced all kinds of wonderful things like playing cards (Cheat to be exact) in the early mornings or learning to ride a bike for the very first time!
They truly are like sisters.
And from a scientific perspective they are technically half-sisters to me and my sister.
Our dads are identical twins you see... and I'd say we all have good genes...