'Father in law' in the Bible

The descendants of the Kenite, Moses’ father-in-law, had gone up with the men of Judah from the City of Palms to the Wilderness of Judah, which was in the Negev of Arad. They went to live among the people.

Now Heber the Kenite had moved away from the Kenites, the sons of Hobab, Moses’ father-in-law, and pitched his tent beside the oak tree of Zaanannim, which was near Kedesh.

His father-in-law, the girl’s father, detained him, and he stayed with him for three days. They ate, drank, and spent the nights there.

The man got up to go, but his father-in-law persuaded him, so he stayed and spent the night there again.

The man got up to go with his concubine and his servant, when his father-in-law, the girl’s father, said to him, “Look, night is coming. Please spend the night. See, the day is almost over. Spend the night here, enjoy yourself, then you can get up early tomorrow for your journey and go home.”