'Father in law' in the Bible

And it was told Tamar, saying, Behold, thy father-in-law goes up to Timnah to shear his sheep.

When she was brought forth, she sent to her father-in-law, saying, By the man, whose these are, I am with child. And she said, Discern, I pray thee, whose these are, the signet, and the cords, and the staff.