'Father in law' in the Bible

And it was told Tamar, saying, Behold your 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, am I with child: and she said, Discern, I pray you, whose are these, the signet, and bracelets, and staff.