It's a term that appears towards the end of partially-standardised French birth certificates (each Mairie seems to have a different version though).

The biological father may not declare himself (please excuse me, I forget the exact wording), so when and if he does, that bit goes in here.

I translated a lot of these for certified translations over an 18-month period recently.

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Note added at 3 hrs (2021-05-15 19:51:35 GMT)
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The term is recognises.

https://fr.besoccer.com/info/maradona-recognises-long-denied...

"Maradona recognises long-denied son"


Here is some text from a template I use:

"MOTHER: SURNAME :
First names :
Date of birth :
Place of birth :
Profession :
Address :

***EVENTS IN RELATION TO DIRECT LINE OF DESCENT*** (prior to the drafting hereof)
The father and mother got married…
Informant: …
Document date and time: …
[...]"

HTH

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Note added at 5 hrs (2021-05-15 21:52:15 GMT)
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To Sarah: you're welcome!

I had a previous translation, but I forgot what it was, before I came up with this one. It's a tricky one.

I don't know if you could actually simplify it to something about parents or parentage, because that's what it amounts to, really.