Yes, every individual will need their own NIF.
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If you are a married couple, you will both need separate NIF numbers.​

You will need your unique NIF number to sign up for health insurance, bank account (even if it’s joint), a cell phone contract, etc.​

See a few more examples here of what you can do with your own NIF in Portugal.

Children also need their own NIF in order to enroll in a school in Portugal.