It's a bit hard to tell who's speaking when, but the formatting's good. The dialogue is a bit on the heavy side.
This could stand some description mixed in. What do the brothers look like to you? How are they alike and different? How old is the child supposed to be?
Certain parts seem repetitive. Were these chapters originally posted separately?
Elrond's sons are only mentioned in passing in the books. It might be cool to see the face-to-face of them fleshed out.
Ah... I get it. The girl is half.