Korean Family Titles
사위
sawi · Son-in-law
Relationship
my daughter → her husband
Who uses it
Parents, about their daughter's husband.
When you call them
Call him by surname + 서방 (seobang), like 김 서방.
When you talk about them
To others, 사위 or 우리 사위.
Example
김 서방, 차 조심해서 가게.Kim-seobang, drive safely.
Based on the standard etiquette of the National Institute of Korean Language; families and regions vary.