HELP!

So last week i had rescued a set of four chins; a 3 legged chin (5 yr), a baby (12 wk), and the babies parents (5 yr). The mom and dad were kept in a single level critter nation. They were fed hamster food. I separated them to their own cages, so i didn't end up with babies. Switched their food to chinchilla food and gave them daily Oxbow multivitamins. Yesterday i went to the playroom (where they are housed) to let the chins out for playtime and both mom and dad were dead. There wasn't any blood or anything. I didn't notice any wounds, they looked as if they just fell asleep. Their poo was normal, they were eating and drinking normally. Though their tummies were poofy.

Could it be the stress of moving and splitting them up? Could it have been the hamster food or switching their food? Maybe bloat? Could it ave been the vitamins?

Do i need to worry about the baby and the 3 legged one? they seem normal and their tummies are fine. poo is normal, they are eating and drinking normally.

PLEASE HELP!