Open the Family Code and read it. The man to whom you answered was right.
The father can be recorded from the words of the mother in the birth certificate of the child. And he will be a pope with all the consequent rights and duties if he does not protest his paternity.

What do you say? What if he doesn’t know that he suddenly became someone’s dad? Well, this is how - some Masha Ivanova went to the hospital, filed an application for the registration of the child, the father recorded Sergey Petrovich Ivanov. Clean from the ballad. Of course, she did not apply for alimony, because she will protest immediately if she learns about such a "gift". And then Sergey Ivanov dies, and here Masha Ivanova comes to the notary, waving the birth certificate of the child, and demands the inheritance due to the "child Ivanov". Who will contest this paternity? Especially if one of his relatives has a widow, and a genetic examination with blood relatives will no longer be carried out. Do not make nonsense. In the books of civil status records specifically indicate that the "father record" is made from the words of the mother, and only such a woman can obtain the status of a single mother with all the privileges. To do this, you need to obtain a certificate on Form 25. Of course, no obligations to her child is carried by any of the full family members of the "imaginary father".