'Father in law' in the Bible
And the sons of the Kenite, father-in-law of Moses, have gone up out of the city of palms with the sons of Judah to the wilderness of Judah, which is in the south of Arad, and they go and dwell with the people.
And Heber the Kenite hath been separated from the Kenite, from the sons of Hobab father-in-law of Moses, and he stretcheth out his tent unto the oak in Zaanaim, which is by Kedesh.
And keep hold on him doth his father-in-law, father of the young woman, and he abideth with him three days, and they eat and drink, and lodge there.
And the man riseth to go, and his father-in-law presseth on him, and he turneth back and lodgeth there.
And the man riseth to go, he and his concubine, and his young man, and his father-in-law, father of the young woman, saith to him, 'Lo, I pray thee, the day hath fallen toward evening, lodge all night, I pray thee; lo, the declining of the day! lodge here, and let thine heart be glad -- and ye have risen early to-morrow for your journey, and thou hast gone to thy tent.'