'Son in law' in the Bible

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

Saul said, I will give her to him, that she may be a snare to him, and that the hand of the Philistines may be against him. Therefore Saul said to David, "You shall this day be my son-in-law a second time."

Saul commanded his servants, "Talk with David secretly, and say, 'Behold, the king has delight in you, and all his servants love you: now therefore be the king's son-in-law.'"

Saul's servants spoke those words in the ears of David. David said, "Does it seems to you a light thing to be the king's son-in-law, since I am a poor man, and lightly esteemed?"

When his servants told David these words, it pleased David well to be the king's son-in-law. The days were not expired;

and David arose and went, he and his men, and killed of the Philistines one hundred men; and David brought their foreskins, and they gave them in full number to the king, that he might be the king's son-in-law. Saul gave him Michal his daughter as wife.

Then Ahimelech answered the king, and said, "Who among all your servants is so faithful as David, who is the king's son-in-law, and is taken into your council, and is honorable in your house?