ANSWER:

If he was not married to their mother, they are not your kinship 

QUESTION: Last time I asked you a question about siblings born out of wedlock. You answered me with a video. From what I understand the father can’t give his name to the children,etc. But what if the father already gave them his name and declared them as his child in front of the Kafir gov. Are they my kinship?

Illegitimate children & Lost property | January 5, 2023 5:05 am
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QUESTION: Please what is the ruling of the inheritance of a child born out of wedlock.
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QUESTION: Ya sheikh people in the masjid sometimes lose their keys .and it would be somewhere in the masjid .so the person who lost it requests the imam to announce in the masjid to handover the key to him .and this is done after salah.is this permissable and how should one find the keys if he lose it in the masjid