comment: >
  
  Legally, they're two different things.
  A prenup is designed to protect past assets i.e. pre-matrimonial assets.
  A paternity test is just whether you pay child maintenance or not. Bear in mind I'm English law based so if you can show the kid isn't yours you don't have to pay. It doesn't determine anything else. 
  When it comes to validity of prenups, if there's no mention/provision for the kid (or child of the family, if not bio kid) then the pre nup may come up for challenge.
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