'Father in law' in the Bible

And his daughter-in-law, the wife of Phinehas, was with child near to be delivered: and when she heard the tidings that the ark of God was taken, and that her father-in-law, and her husband were dead, she bowed herself, and travailed; for her pains came upon her.

And she named the child I-chabod, saying, The glory hath departed from Israel. (Because the ark of God was taken, and because of her father-in-law and her husband.)