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Boy is that ever a relevant question. I know of no hard and fast rule, but in my opinion the bare minimum to still be considered an easter egger, the bird must carry some potential for blue egg color - at least one copy of the blue egg gene. It's hard to know with your chicks there (beautiful!) because I don't know, when you say the mothers are easter eggers, if that means that they are carrying two genes each for egg color and are blue egg layers, or if they are only carrying one or less genes for egg color and lay green or "pink" or brown eggs. That really comes into play when you're trying for olive colored eggs, but if they do grow up to lay those lovely green eggs, then they are for sure easter eggers. If they grow up to lay brown eggs, well, i would no longer call them easter eggers. It is entirely possible to have full siblings from this mating lay different colored eggs and only the girls who grow up to lay the olive eggs will have inherited the blue egg gene and have the potential to pass it on. Any roosters from this crossing would have to be test mated and their daughters' egg colors would tell you if they carried a copy of the blue egg gene. Barnevelders are an exciting match for easter eggers - so pretty and what lovely egg color. I can't wait to see what your chicks grow up to be.