사돈

First attested in the Jeongsok eonhae (正俗諺解 / 정속언해, 1518 (李源周敎授本 / 이원주 교수본), as Middle Korean 사돈.

사돈 • (sadon)

1. co-parent-in-law, parents of one's child-in-law.
   • 사돈의 팔촌

     sadonui palchon

     furthest relative possible

     (literally, “child's spouse's parent's third cousin”)

2. in-law, a relative formed through marriage