'Son in law' in the Bible

For many Judeans had sworn allegiance to him, since he was son-in-law to Arah's son Shecaniah, and his son Jehohanan had married the daughter of Berechiah's son Meshullam.

One of the sons of Eliashib the high priest's son Joiada was a son-in-law to Sanballat the Horonite, so I drove him away from me.