paternity
noun /pəˈtɜːnəti/
  /pəˈtɜːrnəti/
[uncountable]- the fact of being the father of a child
- He refused to admit paternity of the child.
 
Oxford Collocations DictionaryPaternity is used before these nouns:- leave
 - suit
 - test
 - …
 
Word Originlate Middle English: from Old French paternité, from late Latin paternitas, from paternus ‘relating to a father’.