I have three older siblings, a brother who will be 31 next month, a sister who is 28, and another brother who is 27.
It was hard growing up because they weren't really into the whole wanting to play with me thing, but now that I'm older (21) we all get a along just fine. We all really love each other and would do anything for one another.
My brother is married so I also have a sister-in-law, she's basically a real sister because my brother's been with her since they were in high school. They have two little boys and another one on the way in february.
My sister just got engaged and is getting married in August 09, it's really exciting we look at wedding things together. She also has two girls from a previous relationship, she had her first when I was in 6th grade. So I've been an Aunt for 9 years now!
And my other brother has been with his girlfriend basically since jr.high, they weren't together for awhile and she had a baby from some other guy, but my brother raised him since he was a baby and he calls my brother dad, so that's another nephew.