C185 What is the meaning of a relationship

It was dark and humid inside the death cell, and the smell of despair and death filled the air. I finally found Demon Ox and his wife, the three of them, in the innermost cell.

At this moment, Demon Ox was sitting on one of the metal balls with his arms and legs tied with heavy shackles. He was staring out of the window in a daze.

The one on the left was her sister-in-law