'Son in law' in the Bible
The Philistines asked, "Who did this?" They were told, "Samson, the Timnite's son-in-law, because the Timnite took Samson's bride and gave her to his best man." So the Philistines went up and burned her and her father.
On the fourth day they woke up early and the Levite got ready to leave. But the girl's father said to his son-in-law, "Have a bite to eat for some energy, then you can go."
David said to Saul, "Who am I? Who are my relatives or the clan of my father in Israel that I should become the king's son-in-law?"
Saul said, "I will give her to him so that she may become a snare to him and the hand of the Philistines may be against him." So Saul said to David, "Today is the second time for you to become my son-in-law."
Then Saul instructed his servants, "Tell David secretly, 'The king is pleased with you, and all his servants like you. So now become the king's son-in-law."
So Saul's servants spoke these words privately to David. David replied, "Is becoming the king's son-in-law something insignificant to you? I'm just a poor and lightly-esteemed man!"
So his servants told David these things and David agreed to become the king's son-in-law. Now the specified time had not yet expired
when David, along with his men, went out and struck down two hundred Philistine men. David brought their foreskins and presented all of them to the king so he could become the king's son-in-law. Saul then gave him his daughter Michal in marriage.
Ahimelech replied to the king, "Who among all your servants is faithful like David? He is the king's son-in-law, the leader of your bodyguard, and honored in your house!
For many in Judah had sworn allegiance to him, because he was the son-in-law of Shecaniah son of Arah. His son Jonathan had married the daughter of Meshullam son of Berechiah.
Now one of the sons of Joiada son of Eliashib the high priest was a son-in-law of Sanballat the Horonite. So I banished him from my sight.