Karina,
Hope you are doing well.
My son Nicholas will be 18 years old in 3 weeks and has been pressing me about his biological parents. When I asked you about potentially having you do some investigation for me on his biological parents - you cautioned me that I should reconsider doing this. I assume this was because he was under 18 years old. If he is now 18 years old - are there still concerns with Nicholas attempting to find out more information about his biological parents? I'd prefer to know so I can advise him properly. I suspect he will pursue doing this regardless of my help so I would prefer to help manage the process if there are limited or no risks to doing this. Thank you.
Yes, your consent is required according to Article 139 of Russian Family Code and Article 47 of the Federal Law "About Civil Records Acts".
It means that your daughter cannot legally get information about her biological parents.
But most likely she can do it through a private investigator.