They are not cream, they are called 'snow' were they born pure white or have any markings showimg?
Mum has to carry snow, or she wouldnt have produced any snow kittens. Are you just looking at a 5 gen pedigree when you say she is all silver as they can carry genes for many many many years, so Id be looking back at all of her family, I love family tree research!
One of dads parents Has to be brown so his pedigree cant all be snows!
Looks like from the picture (quite dark) 2 brown spotted, 1 brown marble and 2 snows, again cant really tell from a picture but they look like seal lynx (blue eye) on the right and poss the same on the left but he could be a seal mink (green eye) if he was born with a darker pattern.
Are they pk-def & hcm health tested etc? Is this your first litter? You really need a mentor, did the people you buy these cats from not explain all of this? Or ask you why you wanted to breed etc? Colours are pretty 'easy' in this breed as there arent hundreds to learn, so should have been researched beforehand really, love colour research so interesting!