'Father in law' in the Bible

Now the descendants of the Kenite, Moses' father-in-law, went up with the people of Judah from the City of Date Palm Trees to Arad in the desert of Judah, located in the Negev. They went and lived with the people of Judah.

Now Heber the Kenite had moved away from the Kenites, the descendants of Hobab, Moses' father-in-law. He lived near the great tree in Zaanannim near Kedesh.

His father-in-law, the girl's father, persuaded him to stay with him for three days, and they ate and drank together, and spent the night there.

When the man got ready to leave, his father-in-law convinced him to stay another night.

When the man got ready to leave with his concubine and his servant, his father-in-law, the girl's father, said to him, "Look! The day is almost over! Stay another night! Since the day is over, stay another night here and have a good time. You can get up early tomorrow and start your trip home."