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Correct. The chicks are not sex-linked, so no-one can tell the gender until the chicks grow old enough to tell by combs, wattles, or other means.

So the mother is a Midnight Majesty Maran. I think those are mostly black, with a little bit of red/gold, and no white barring. If that is what the mother looks like, I do not think she can produce any kind of sexlink chicks, with any possible kind of rooster.