'Father in law' in the Bible

The sons of [Jethro] the Kenite, Moses’ father-in-law, went up from the City of Palms (Jericho) with the sons of Judah, to the wilderness of Judah which is in the Negev (South country) near Arad; and they went and lived with the people.

Now Heber the Kenite had separated himself from the Kenites, from the sons of Hobab the father-in-law of Moses, and had pitched his tent as far away as the terebinth tree in Zaanannim, which is near Kedesh.

So his father-in-law, the girl’s father, detained him; and he stayed there with him for three days. So they ate and drank, and he lodged there.

Then the man got up to leave, but his father-in-law urged him [strongly to remain]; so he spent the night there again.

When the man and his concubine and his servant got up to leave, his father-in-law, the girl’s father, said to him, “Behold, now the day has drawn to a close; please spend the night. Look, now the day comes to an end; spend the night here and celebrate, enjoy yourself. Then tomorrow you may get up early for your journey and go home.”