@glomoro really late reply but older relatives of the same generation are also referred to as "older brother" or "older sister" in most asian countries. This is also used sometimes for strangers when you don't know their name
@akera93 it's probably not his actual reason for wanting to deny the marriage, since aisha already noted that she was not going to be considered an heir even before meeting the duke
God I really fucking hate it when the mcs in these isekai are like “omg I gotta have soy sauce” or “omg I gotta have rice” as a Japanese person. It’s the same kind of fucking annoying as being like “nippon steel is the strongest in the world”