The best replacement for paternity is maternity.

The best alternatives to paternity are rated as following:
★★★★★  maternity
★★★  biological paternity
★  paternity
  dna test

Your alternative for paternity is not listed? Suggest!
Speaking about paternity, one probably shouldn't forget about dna testing.

Other search terms related to paternity and their ratings are:
★★★★★ dna testing
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biological paternity