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There is no color referred to simply as "gray" in rabbit colors. Understand, now, that I don't breed Flemish, so I'm just guessing from the description what these names mean - Flemish have a "Light Gray" (looks more like a Dilute Chin (Squirrel) than anything else I can think of) and a "Steel Gray" which is probably a Steeled Chinchilla. The mixed-breed rabbit that the OP called a grey is probably either an Opal or a Squirrel, so it could be the father of the litter. Fawn is supposed to be a dilute, non-extension chestnut, so it is a possible sire as well [I just looked it up, Flemish "Fawns" have brown eyes, so they apparently aren't dilutes after all!!] I don't know if the OP's Blue Steel is Steeled Chestnut base or a Steeled Chin, so I can't be sure if we can rule him out or not.