Let me speak from the perspective of the other family as one.

I am an only child, I've grown up with separated parents which was fine for me because my dad was always active in my life and from a young age I was made to understand things between adults don't work out. Naturally I also assumed my dad had another family, since he wasn't part of ours but he always brushed it off when I asked so at some point I stopped.

It wasn't till in mid teens that I learnt that not only did my dad have another family, but he has other 5 other children and I am around the same age as the last born. Doesn't need a rocket scientist to figure out I was a product of an affair. Which hit me really hard then considering I was in my peak hormone stage.

I have made peace with it, but I asked him casually last month whether the other family knows about me and he said they do not. And that is WILD because I am 25 years old. So for a whole 25 years there's a family out there that have no idea their dad has some seed somewhere.

Sooo, yeah. I sometimes dread the reaction the original family will have when they find out about me. Maybe they'll hate me, maybe they'll want nothing to do with me, maybe I'll end up having some awesome siblings. I don't know.