Breed of 3 week old chick?

[Sussex19]

Sorry I don’t. If you’re absolutely certain that the cuckoo orp hen is not the mother than the cuckoo orp rooster has to be the father. Black is dominant, it looks like some red peeking through In some of the feathers so maybe the Rhode Island red? You’ll probably have to wait till it feathers in more to get a better idea.

Well it could be the orp hen, but the two chicks that I know are hers don't have any of that brown, and are a slightly different shape... I had been thinking that it could be the SS, but now I'm learning more it doesn't seem so likely. I'll post new pics when he's a bit older. Thanks for helping!