What a cool thread! I hope more people come in...
My youngest brother, B., (not yet 15) is a clear Boromir. It's a good thing he's the youngest of the four of us; he's a born leader, and if the oldest, he'd have bossed us to death! My oldest brother, N., (19) is strong-willed, but B. is even more so. On his tee-ball team, when he was 5ish, he earned the nickname "The Little General"! Napoleon Bonaparte himself was merely the Little Corporal.

B.'s good at sports, and really enjoys them; currently, basketball is the favorite. And he loves warlike games - computer, Airsoft, little army guys (when he was younger... and not so young... ) - and lately war books. Boromir is his favorite character in the books and the movies, too. If a Vala, he would be Tulkas, I think.
Now, N., the oldest... I see him more as a Denethor. Not the negative qualities so much, but more because of the similarities between he and B. N.'s like B., with the sports ability; N.'s very good, both at baseball and basketball - he was no shabby pitcher, and was very quick and competitive on defense - but simply doesn't enjoy it so much as B. Also, N. has just as intense an interest in the same war games as B. If there's a difference, it's that he enjoys learning and using strategy just as much as tactics. On both counts, I think this mirrors Denethor. Or Aragorn. Or Manwë.
T.'s the middle boy, at 17. It's a little hard to think what he is; really, he's a renaissance man! Like the other two, he's got all the warlike interests, and loves to play with his brothers; I'd say he likes it the least out of the three, but that's not saying much! He wants to be an engineer, enjoys science (which none of the rest of us, or my parents, do), and is a year ahead in math. He likes taking things apart and figuring out how they work. On the other hand, T. loves music,
and he's good at it. He sings bass in choir and plays piano, cornet, and fife; I'm not a bad pianist, but he is
good. He's taking AP English for the 2nd or 3rd year and doing very well indeed; he's not always very articulate in speaking, but he's an excellent writer. And he loves people - being around them, talking with them, joking with them... He's a really neat guy! How to you classify someone like that? He's definitely got some Faramir aspects (good at war, loves learning); but an engineer sounds like a Noldo - or Aulë. And music - the Teleri? Perhaps Celebrimbor; that's the jeweler chap, correct?
My father would perhaps be Elrond, for he has learned much and is gifted as a teacher. But if so, he is an active Elrond, for he also loves playing games. He's helped coach a lot of my brothers teams, both baseball and basketball; now, he likes long bike trips and playing Medal of Honor on the computer. When I was home over the break, we finally managed to complete our home network. That meant in the evenings, I was kicked off my computer so that all four guys could hunt for each other in Stalingrad, Anzio, Sicily, etc.

My father and N. are quite similar - but Daddy is no Denethor.
My mother is both Gandalf and Elrond, for she is both very wise and very learned. And she does not lack courage and persistence - she has homeschooled both myself and N. through all 13 years, and is finishing up with T. and B. She is the one person I know who is like Varda. Sometimes she just...
knows things. And not just about us kids, either.
And I? I don't know! The more I analyze myself, the more contrasts I come up with. I
think my temperament is phlegmatic - which would make me Treebeard. But in many ways, I resemble T. (or he resembles me - I
am the eldest, after all), except in the engineering and science areas. And even there, it's not that I can't do it; I have very good grades in math and science and my minor is computer science; but I don't have his interest in it. On the other hand, while I don't build things, I do love sewing - especially costuming. I usually don't just following instructions and patterns. If that's not creation, what is?
Come to think of it, I'm most like Arwen. Although I enjoy doing things, I truly
like staying at home and hearing about what others do. I like sewing and creating on my own; I love music, although I'm only a moderate performer. I want to be a helpmate for my husband; I want to support him and bring him honor and joy. And I'm a leader, in my own subtle way; I'm an efficient mover behind the scenes.
*looks at the length of the post* And it appears I'm a writer, as well! Besides missing my family... I moved back to school yesterday. *sigh* Graduation, here I come!
Nuranar