'Father in law' in the Bible

Now, the sons of the Kenite, father-in-law of Moses, had come up from the city of palm-trees, with the sons of Judah, into the wilderness of Judah, which is in the south of Arad, - so they went and dwelt with the people.

Now, Heber the Kenite, had separated himself from the Kenites, even from the sons of Hobab, father-in-law of Moses, - and moved his tent as far as the oak of Zaanaim, which is near Kadesh.

And his father-in-law, the father of the damsel, constrained him, and he abode with him three days, - and they did eat and drink, and lodged there.

And, when the man rose up to go, his father-in-law pressed him, so he turned back and tarried the night there.

And, when the man rose up to go - he and his concubine and his young man, - his father-in-law, the father of the damsel, said to him, Come now, see! the day hath sunk down towards evening, come now! tarry the night; lo! the day goeth down, tarry the night here, and let thy heart be glad, so shall ye rise early to-morrow for your journey, and thou shalt go thy way to thine own home.