Can biological dad intervienne after my sons stepdad adopts him?

[Anonapple]

This is largely theoretical as I haven’t been seeing my partner long enough but being in this relationship has made me think.

My sons biological dad moved away when I was 15 weeks pregnant, he’s never tried to make contact with my son and has never asked about him. He’s not on the birth certificate.

Theoretically, if in the future I had a partner who I saw fit to adopt my son, what would happen if my sons biological father attempted to get involved after the adoption went ahead? I’ve read online that usually in cases where the biological parent has hadn’t no involvement in the child’s life and has given no child support, their permission is not needed for the adoption to go ahead. But I’m just unsure what would happen if in the future after adoption he tried to suddenly get involved after never having met or contributed to my sons life. Would he have any rights? Would he be able to get himself put on the birth certificate?

Again, mainly theoretical as it wouldn’t happen any time soon.

My understanding is that as he was not married to you when the child was born or is named on the birth certificate he has no legal parental rights. I think if he turned up now and wished to claim parental rights who would have to fight it through the courts. I imagine if he turned up out of the blue after an adoption order granted to step dad he could not be granted legal parental rights.

That said you if he did turn up and your child was interested in him in the best of interest of your child you would be best advised to support some sort of contact if it benefited your child. This would be entirely different though that any legal rights and responsibilities.

I don't know any of the legalities, but my stepdad adopted me when he married my mum. My biological father never had any involvement with me and I am 99% sure they didn't have to say anything to him. And they were married for 10 years before he divorced her whilst she was pregnant with me but that's another story

The biological dad would have no legal rights over the child if they were adopted so no he could not get involved in the childs life at all.
The child could choose to contact them post 18 but not the other way round. That is the legal situation and why adoption is a huge step because it removes a birth parents parental rights and cannot be reversed down the line.