'Father in law' in the Bible

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

When she was brought forth, she sent to her father-in-law, saying, By the man to whom these belong am I with child; and she said, Acknowledge, I pray thee, whose are this signet, and this lace, and this staff.