'Son in law' in the Bible

David told Saul, "Who am I and what is my life or my father's family in Israel that I should be the king's son-in-law?"

Saul told himself, "I'll give her to him and she can be a snare to him and the Philistines will harm him." So Saul told David, "For a second time you can be my son-in-law today."

Saul commanded his officials, "Speak with David privately and say, "Look, the king delights in you, and all his officials love you. Now become the king's son-in-law.'"

Saul's officials delivered this message to David, and he asked, "Is becoming the king's son-in-law an unimportant thing to you? I'm a poor and unimportant man."

When his officials delivered this message to David, David decided it would be a good thing to become the king's son-in-law. Before the time was up,

David got up, went out with his men, and struck down 200 Philistine men. David brought their foreskins and gave them all to the king so he could become the king's son-in-law. So Saul gave him his daughter Michal as a wife.

Ahimelech answered the king, "Who among all your officials is as faithful as David? He is the king's son-in-law, the captain of your bodyguard, and he's honored in your household.