'Father in law' in the Bible

The descendants of the Kenites, the tribe from which Moses' father-in-law came, accompanied the descendants of Judah from the city of the palms to the Judean wilderness, which is in the desert area south of Arad, and lived with the people there.

Meanwhile, Heber the Kenite had been separated from the Kenites, the descendants of Moses' father-in-law Hobab. He had pitched his tents far away, near the Elon-bezaanannim.

A while later during the wheat harvest, Samson visited his wife, bringing along a young goat, and told his father-in-law, "I'm going into my wife's room." But her father wouldn't give permission for him to go.

Then the Philistines demanded, "Who did this?" Someone said, "Samson, son-in-law of the Timnite, because his father-in-law took Samson's wife and gave her to the best man at Samson's wedding." In retaliation, the Philistines came up and burned her and her father to death.

The young woman's father (that is, his father-in-law) made him stay there for three days while they ate and drank during his visit there.

On the fourth day, they got up early that morning, and the descendant of Levi got ready to leave. Then the young woman's father-in-law told him, "Fortify yourself by eating some food before you go."

The man got up, intending to leave, but his father-in-law urged him to spend the night there again.

On the fifth day, he got up early in the morning, but the young woman's father-in-law told him, "Please, fortify yourself," so they delayed until later that afternoon while both of them ate together.

When the man got up to leave with his mistress and servant, his father-in-law, the young woman's father, told him, "Look now, evening is coming, so please spend another night. See how the daylight is fading, so spend the night here and enjoy yourself. Then tomorrow get up early and leave on your journey home."