I am watching Sweet 18, and I noticed that the sister in law seems to have some sort of authority ordering Jung Sook around. I could understand this coming from parents or grandparents, but something does not feel right about a sibling doing this.
I bring this up because I have seen this in other dramas. An example is "Our Glamorous Time" where it seems that the female lead's brother has authority over the leads, an they need to convince him before they can do some things.
So the question is, can a sibling or should a sibling have authority over a couple?
