well, Im an only child, and as nice as that might sound, be very thankful you have them!
I used to get so jealous because my 2 best friends used to be sisters. I would watch them and wish I had a sister so bad, because I would think there is no bond like sister's have.
please be thankful for what you have, and learn to love yourself for what you can do! trust me, your sister isn't perfect, even though she may seem that way. There are things you can do better than she can. and vice versa.
I can't say enough that If I could trade everything for a sister or brother to laugh, cry, and grow up with, I would in a second.
~*Jill*~ Teacher, Advanced BSc in Psychology
"You can unlock any door as long as you have the right key". Mrs. Brisby, Secret of Nimh