I am getting ducklings the first week of Feb. from Randall Burkley hatcheries. I will get 5 of each of the following Rouen, Cayuga, Blue Swedish and Kahki Campbell. I am hoping out of 5 of each I will get a least a couple of ducks and at least one drake. My question is when receiving chicks from hatcheries is it safe to assume that they are not siblings? I don't want to breed brother and sister - may not hurt but just seems wrong.