paternity(pa·ter·ni·ty)

http://oxforddictionaries.com/definition/paternity?region=us

Pronunciation:/pəˈternitē, /

noun

• 1 (especially in legal contexts) the state of being someone's father:he refused to admit paternity of the child
• 2 paternal origin:his enemies made great play of the supposed dubiety of his paternity

Origin:

late Middle English: from Old French paternité, from late Latin paternitas, from paternus 'relating to a father'