(Do you see those Snow Village houses in the background--they were a staple of our childhood!)
Like other siblings, we had our moments where we kicked each other under the covers when forced to sleep in the same bed on family vacations. But for the most part, we've been close.
My sister is a good friend. She's still best friends with the same girls who she played with when she was six and she still keeps in touch with her friends from high school and college.