The Nerdanel reference article from the English Wikipedia on 24-Apr-2004
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Nerdanel

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Nerdanel is a fictional character from J. R. R. Tolkien's writings.

Nerdanel was the wife of Fëanor and the daughter of Mahtan. She had red hair like her father, which was rare among the Eldar. She was not regarded beautiful among her people. She was peaceful and became estranged from her husband following his deeds regarding the Silmarils. She bore to him seven sons, Maedhros, Maglor, Celegorm, Caranthir, Curufin, Amrod and Amras.

Family tree

 Mahtan

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Nerdanel = Fëanor

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  Maedhros Maglor Celegorm  Caranthir     Curufin    Amrod       Amras 

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                                         Celebrimbor