To have a fool for a child brings grief; there is no joy for the parent of a godless fool.
Read Proverbs 17:21 Using Other Translations
He that begetteth a fool doeth it to his sorrow: and the father of a fool hath no joy.
He who sires a fool gets himself sorrow, and the father of a fool has no joy.
It is painful to be the parent of a fool; there is no joy for the father of a rebel.
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(New International Version Bible Online)