I'm pretty sure there all pied, pied can come in many forms and patterns, to have barred the duckling have to be yellow with a black bill and black feet and not just some black it has to be all black
We're they kinda blue at birth because I had some brown babies like they weren't like the black kind of brown they were more of an off brown an they turned out blue! But they were bluish when they hatched so they turned brown
U said that the mom was white, well white is co dominat with black...