Korean Family Titles
처형
cheohyeong · Wife's older sister
Relationship
my wife → her older sister
Who uses it
A husband, about his wife's older sister.
When you call them
Call her 처형.
When you talk about them
To others, 처형.
Example
처형, 조카들은 잘 지내죠?Cheohyeong, are the kids doing well?
Based on the standard etiquette of the National Institute of Korean Language; families and regions vary.