Hi V.,
I have had many types of rodents in my life and I have to say that as long as you are up for being the one to have to take care of the animal, it is a great idea for your boys to have a pet. They can help with many aspects of its care, but essentially it will be you who has to do the work.
With that being said, I like chinchillas. They are expensive to start out (with cage and food and dust bath and the animal itself....) but once the major expenses are taken care of, it's not to bad. I spend about $20 a month on food, bedding, and wood chews for mine. They also do not have short lifespans like other rodents.
They do not get a regular bath like most animals. Instead, you put a small amount of dust (from the pet store) in a shallow dish or a specially made bath house (the dish is more amusing to watch) and let them have at it. They will roll around in it and get themselves clean.
They also do not smell like most rodents. I clean "Roo's" cage once a week and have never had a problem with odor, which you can get with other types of rodents.
Roo is awake for a good part of the afternoon, unlike other rodents who are completely nocturnal. He usually wakes up about the time my kids are done with homework and dinner, and is ready to play. We take him out for about an hour and let him play in the hallway with all the doors closed and towels under them so that he can not get into the bedrooms and get lost.
They can jump if they want to, so I have to supervise playtime so that he does not jump the baby gate that we use. But he climbs all over all of us and even enjoys playing in empty boxes or with small stuffed animals or toilet paper rolls. He even loves to play with our dogs, but I don't let them play with him outside of his cage because I don't know what they would do to him.
I think my favorite thing about chinchilla's is that they have personality. I never imagined a rodent could have so much personality, but Roo never fails to keep us laughing.
Whatever you decide, just make sure that you are willing and able to take on a little more responsibility. Having pets is a great way to teach kids to take responsibility and compassion, but be prepared to do it yourself since your boys are young.
I hope this information helps a little. If you want to know more or have any questions about life with a chinchilla, don't hesitate to send me a message!