I have three older brothers.
Matt is 26 (7 years older than me) living in Boston. I don't see him much and I'm not a huge fan of him. He really cares about us (his siblings), has a good heart, and I love him, but he's very judgmental of us and can be very loud and obnoxious (which a lot of people apparently like). He's just so incredibly different from me, and is not very accepting of those differences. He was the popular kid, very outgoing (he's a salesman), good looking, social, happy-go-lucky, won best dressed in high school, goes out every weekend etc. I am quiet, have social anxiety, don't wear skirts or dresses unless I have to, don't wear makeup, don't drink, can barely hold a conversation etc. We're polar opposites and Matt wants to know what's wrong with me and wants it fixed. So I like to avoid him. This is a more recent thing I think, since he went to college I guess. When I was little I think he was a good older sibling, but we never really had a close relationship or played together that I can remember, probably because of the age difference, though I do remember being included in some of my brothers' games and I enjoyed watching them play together. But the discomfort I feel with him is more recent.
Danny just turned 25, so 6 years older than me. He moved out of the house this year. He is very similar to me in many ways. We both have social anxiety and are quiet. We hold a lot of the same opinions so in any argument are usually on the same side. I like Danny a lot, I find him funny and easy to be around, we're in tune to each other I guess. The only big difference I guess is he's more easily stressed than I am and more confrontational, but that doesn't really affect our relationship. I think our relationship has gotten better as we have gotten older. Not that we had problems before, but again I don't think we really did much together due to the age difference.
Brian is 21, 2 years older than me. As children we did the most together and I was closest to me (though he was probably closest to Matt). As we got older (like middle school) Brian was a bit of jerk and picked on me a bit, typical brother-sister stuff. I found him annoying and mean for several years. Then around the time he went to college our relationship improved again and I like him a lot. Brian's just a really good person. He had anxiety (not social, just general) that he got help and meds for. So he's not judgmental. He likes playing the older brother part and giving advice (though I'm stubborn and don't like to hear it). He is mom's favorite (yes your children can tell) which is fine by me. We have a nice adult sibling relationship.
I wouldn't say I'm "close" to any of my siblings. We don't really talk about stuff or do anything together. But we all have different levels of getting along.
Now if you want insight into how THEY get along with each other, read on (some is just observation, some has been voiced), if you don't want to know stop here.
Matt: His relationship is best with Brian. They played a lot as kids, Brian being Matt's punching bag mostly, but Brian must have enjoyed it lol. Brian is social, likes to party at school, likes to talk about girls, is interested in being popular, etc. and likes to take advice on such things from Matt, so Matt likes him. Matt teases Brian but Brian finds it funny, he has a good sense of humor and can take a joke.
As I said Matt is very judgmental of me, and also my brother Danny as we are so similar. Therefore Matt doesn't really like Danny because he's not "right" in Matt's eyes. He's boring and too serious. From what he's told mom (and then she's told us) he is worried about us, thinks we're miserable and depressed.
Danny: Isn't fond of Matt. As kids they played a ton, but as they aged Matt was better than Danny at everything and do to the closeness of age this caused comparisons (not necessarily by our parents) and of course they were often involved in the same things because they are only a year apart. Danny holds a grudge against Matt. Danny always felt inferior to Matt, always in second place. Plus nobody likes to feel judged and Matt does judge and is very open about voicing his opinions on you, it doesn't make Danny feel good. They don't fight or anything, but they're not exactly friends. Danny likes Brian, same as me I supposed. They have some of the same interests and appear to find each other funny. Danny probably likes Brian the same as he likes me. Like I said it's hard to dislike Brian, he's just a good person with a good sense of humor.
Brian: Probably likes Matt the most, they do talk a lot about "stuff" unlike the rest of us. He has and has always had a lot of fun with Matt. He still gets ticked off when he finds out Matt has stolen his shirt or something, as Matt often did when he lived here, but their relationship is good. It's hard to tell exactly how Brian feels about me and Danny because unlike Matt he doesn't come right out and criticize us. I think he finds us rather dull because we don't go out and do stuff, but still likes us just fine, talks to us, is able to enjoy us.
More than you wanted to know I'm sure