'Father in law' in the Bible

The descendants of the Kenite, Moses’ father-in-law, went up from the city of palms with the sons of Judah, to the wilderness of Judah which is in the south of 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 oak in Zaanannim, which is near Kedesh.

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

Then the man arose to go, but his father-in-law urged him so that he spent the night there again.

When the man arose to go along with his concubine and servant, his father-in-law, the girl’s father, said to him, “Behold now, the day has drawn to a close; please spend the night. Lo, the day is coming to an end; spend the night here that your heart may be merry. Then tomorrow you may arise early for your journey so that you may go home.”