Help my poor unknown colored gerbies!

[Mary McDermott]

I have a pair of gerbils that keep producing these creamish colored gerbils,
the parents are a dove mother, a black father, and her siblings
(brothers/sisters) are REW, black, dove, and more of the funny creamy thingie
doos.  What do you think they could be?
                       Mary <~~~~ really needs help!