I'm assuming that you bred the siblings back to each other? I ran the chicken calculator with what you are describing and you can basically get anything from yellow, buff, golden, red, light....biggest percentage is yellow/golden in a male. I don't see the dark brahma coloring as one of the outcomes, but I guessed a bit on the coloring because the male from the original mix that you mentioned should have come out yellow/golden, not silver (I used the yellow/golden, not light). Should be interesting. After it dries a bit, take a picture for us! We can't wait to see what you end up with!I have some strange mutt brahmas. They are the offspring of a buff brahma cock over a light x dark brahma hen. ( i bought them like that as my very 1st chicks. The cockerels are colored like lights and pullets are buff colored. Anyways i got a bator and hatched 1 of the eggs. Any ideas on what it will look like. Its still wet but it looks like a dark brahma color now