The forum doesn't support breeding at all, unless you're a member of an ethical hamster association, such as the National Hamster Council in the Uk or the California Hamster Association in the US, and have a mentor who is a verified ethical breeder.
All dwarf hamsters will be hybrids - unless you get pedigree dwarf hamsters from an ethical breeder and these are extremely rare to find. There are no Campbells breeders in the US and I think only one or two in the UK, and not that many Winter White breeders either.
Breeding hybrid dwarf hamsters has far too many risks for the hamsters, as elusive says. Sadly it happens in rodent mills, which is where the hamsters in pet shops usually come from, and what you don't see is all the ones that didn't make it to the pet shop - either dying in giving birth or born with defects.
The two species should never have been bred together, as if the Mother is more one species than the other, the babies could be too big for her to give birth to and that is a horribly painful way to die.
Which country are you in? If you want a hamster for your housemate as well, why not just adopt two hamsters? They cost so little to buy and there are a lot of litters needing homes in rodent rescues.
Just to clarify, there are two species of Russian dwarf hamsters - Winter Whites, and Campbells. But all hamsters you will find will be hybrids of these two species that have been interbred for decades, partly by accident and partly due to bad breeding practices. Unless you find one from an ethical breeder who is part of a verified hamster association (where they have standards) and the hamster has a pedigree ancestry certificate.
Even if you did find two pedigree Russian Dwarfs that were either both Campbells or both Winter Whites, you would still need a breeding mentor as there are so many risks involved to both Mother and babies.
Ethical breeders breed to keep the species in tact and to keep certain lines for health, temperament etc. They also don't breed for profit (usually at a loss).
It's great that you want a hamster for yourself and your house mate though - adopting is best. If you let us know which country/region you're in we can let you know the nearest rodent rescue. The one near me is always inundated with litters of dwarf hamsters that have been rescued.