Good representation of sibling dynamic where it is the main focus in the plot? I like to see them fighting each other, hating each other. But they would still choose each other over anyone else and love them because they have a very deep bond. They might hurt each other but they care about them a lot more than hurting.
What i don't want :
only one sibling being bad and other is too good.
Both sibling loving the same person.
Incest