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The parents are cochin and rhode island red, the bird does not have an Ameraucana as a grandparent. The grandparents are cochin and rhode island red.
If the mother was barred, the son would at least have barring in the tail. If the mother was a purebred barred rock, the son would be black/barred.
[[[........dad is a Cochin, mom is a Bard Rock.....]]]]]]
The only way that dad can be a cochin is if both of his parents are cochins. The only way mom can be a barred rock is if both her parents are barred rocks. So if the parents are a cochin and a barred rock, you have 1 granddad and one grandma who are cochin, and you have 1 granddad and one grandma who are barred rock.