Do lots of research, ferrets dont smell if they are neutered/cleaned out regular, every animal as its own smell
and i dont think its any worse than cat/dog smell.
If a ferret bites, majority of the time is a reason behind why its biting, handle them regular and interact with em
and they make fantastic companions.
But you need alot of time, you need to get the biggest hutch you can afford or have space for, the bigger the better for
the ferrets.
They cannot be stuck in a cage all the time, your parents would have to let it out to give it exercise for a couple of hours a day would they do