I have a brother and a sister. If you want step-siblings, I have two stepbrothers too. The only one that lives with me right now is my little brother, since the others are older than me (my sister is 3 years older than me, and my stepbrothers are older than her). We're all getting old o_O I'm 16, and my little brother is a pre-teen. (Man, I hope he's going to be a decent teen... but then again, I might not be there for it, depending on when my parents move away.)
As for how well I get along... I get along great with my sister. She's awesome. <3
I didn't get along with the younger of my two stepbrothers too much when we first met, he picked on me. ;_; However, he grew up to be cool. :3 We have our confliciting views, but meh, don't we all? I pretty much get along with both of my stepbrothers these days.
My little brother... we get on each others nerves. XD But overall, we still like each other. We just have some bad moments sometimes.