then this one:

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No children (2 Samuel 6:23) - "And Michal the daughter of Saul had no child to the day of her death."
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Five sons (2 Sam. 21:8) - "But the king took the two sons of Rizpah the daughter of Aiah, whom she bare unto Saul, Armoni and Mephibosheth; and the five sons of Michal the daughter of Saul, whom she brought up for Adriel the son of Barzillai the Meholathite" (KJV).