OH wow....LOL.
I am my mother's oldest child. I am my bio father's second oldest child. I am my step father's (he adopted me as a teenager) 4th child.
So....
Step-Monsters (er, sisters...I meant SISTERS) Linda and Janet. Nope not close. They are about 18 years older than I am. No relationship and I'd like it to stay that way. They were awful to me when I was a kid, horrendous to me as an adult. No thanks.
Half-sister is 2 years older than I am. We didn't grow up together. Her mom was smarter than mine and left our bio father when she was 6 months old. She kept her hidden, literally, until she was 16 years old. We began a relationship at that time and have grown close although our busy lives of homeschooling and being moms/wives etc keep us from spending much time together. I saw her for the first time since 2007 this past May for 24 hours. You take what you can get.
Brother, younger than I am by 4 years...close as kids, we've grown apart as adults mostly because our parents have manipulated relationships and really, I don't want to get into THAT.

Half-sister...younger than I am by 9 years. Close growing up. When I moved out of the house she was only 9. I spent several years not spending time with her living my own life with college, babies, husband, work. We aren't as close as either of us would like now but my hubby being military has me away from our hometown so we take what time we can get.
LOL..again, sorry you asked??? LOL I have a bad family situation. Truly. It's stressful and hard and well, lonely at times because I have no one other than my hubby and kids. And friends. I have LOTS of those.