'Brother in law' in the Bible

And the sons of the Kenite, Moses' brother-in-law, went up out of the city of palm trees with the sons of Judah into the wilderness of Judah, which is in the south of Arad, and they went and dwelt with the people.

Now Heber the Kenite had separated himself from the Kenites, even from the sons of Hobab the brother-in-law of Moses, and had pitched his tent as far as the oak in Zaanannim, which is by Kedesh.