Hw yo say sister-in-law in Korean? 형수, 제수, 처형, 처제, 시누이, 올케, all mean "sister in law!" It is mind blowing! Which one do Koreans use and when? Is it about whose sister in law it is? Like my dad' sister in law, my mom's, my own, my female friend, my male friend's my husband's sister in law, etc? Thank you so much in advance!