Responses

https://www.mangago.zone/read-manga/maou_no_kikan/
https://www.mangago.zone/read-manga/suiyou_kyoudai/
https://www.mangago.zone/read-manga/we_are_peaceful_brothers/
https://www.mangago.zone/read-manga/home_at_the_horizon/
https://www.mangago.zone/read-manga/please_take_my_brother_away/
https://www.mangago.zone/read-manga/at_each_others_throats/
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