The LORD's prophet Ahijah had earlier said, “Not one man or boy in Jeroboam's family will be left alive.” And, as soon as Baasha became king, he killed everyone in Jeroboam's family,
Your whole family will be wiped out, just like the families of King Jeroboam and King Baasha. You've made the LORD very angry by sinning and causing the Israelites to sin.
Then Jehu killed the rest of Ahab's relatives living in Jezreel, as well as his highest officials, his priests, and his closest friends. No one in Ahab's family was left alive in Jezreel.