What bedding are they on? Sounds like perhaps an allergy/sensitivity thing if it's mostly their undersides.
Often mites in hamsters isn't so much a contagious thing. They have some mites all the time that don't bother them unless their immune systems are low anyway (because they're ill, stressed or just very old or very young) so it could still be mites and their mother and litter mates just have stronger immune systems - you mentioned these two were the smallest? Mites can be tricky cos they don't always itch either.
Diet sounds ok to me...I think I'd still add a vit supplement, maybe change the substrate to see if that helps. The fur not coming out when tugged means fungal infection is unlikely (and you would expect that to show in the other hamsters too). Failing vits & bedding helping then a trip to a decent vet would be in order - they can rule in mites with a positive skin scrape, but not rule them out with a negative one as it's possible to miss the mites.
Hope they get furry again!
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Emma
Hamster Central Moderator
Owned by Merry, Pippin, Lola & Shirley (roborovskis) Toby & Hazel (syrians)
Missing my angel Phoebe
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