Need help finding manga

I don't remember what the mc looked like or anything, I recall is one scene where they were at a meeting because their family was the mediator between two countries, one had a green haired elf dude who pretended not to know the language and his translator wasn't translating the sentences properly, so the mc got involved, though the mc's brother, who doesn't like them, was against it but ended up going with it because they were helping...if anyone knows the name, please let me know!