I think these birds are beautiful. I also can see what Cottagegarden is saying. Just like with any Ameraucana line or Silkie line or whatever, you have to cull birds with unwanted characteristics to get the line to breed true and to make them better than the previous generation. I believe this isn't just a mutation. I think the birds shown in your second generation are showing more Silkie characteristics then the parents, so no doubt there was a Silkie in the ancestry. No huge deal, they aren't pure Ameraucana, but outcrosses occur all the time though to get new colors and patterns into the breed, and all ameraucanas were breed up from EE's waaay back when to start with. Bringing in other genes from an outside breed isn't unheard of, but to make things clear I'd call these EE's or Ameraucana project birds if you're going to keep the project going, as to not ruffle any feathers, and just to be correct. Just be sure to keep breeding and culling these until they breed true for many generations. I'd love to get some, and did contact you about them a little while back, but have so many other projects going right now. I just can't spare any incubator space at the moment. Maybe before the year is up, if they're still laying. They really are cutie pies!