2 Samuel 6:23
And Michal daughter of Saul had no children to the day of her death.
2 Samuel 21:8
NKJV: So the king took Armoni and Mephibosheth, the two sons of Rizpah the daughter of Aiah, whom she bore to Saul, and the five sons of Michal the daughter of Saul, whom she brought up for Adriel the son of Barzillai the Meholathite
NIV: But the king took Armoni and Mephibosheth, the two sons of Aiah's daughter Rizpah, whom she had borne to Saul, together with the five sons of Saul's daughter Merab, whom she had borne to Adriel son of Barzillai the Meholathite.