Scarlett,
I didn't really want to get involved in this discussion, but I think some things have not been said.
I commend the questions that you have asked and no doubt believe in the intelligence of your children. That being said, there is a real difference between intelligence and experience. Chameleons are not a starter reptile. You can read all you want about them, but there are husbandry issues that are not altogether intuitive. I am also troubled that your children will be in charge of this reptile, but you are the one asking questions on the forum instead of them.
I do know there are a few exceptional young herp keepers on this forum that now keep chameleons (mostly on their own). With few exceptions, I believe most of them started with another species. Something like a bearded dragon, or leopard gecko come to mind. These species are social, more tolerant of handling, and more forgiving about husbandry mistakes...
An example- I had an 12 week old bearded dragon come into my clinic 4 weeks ago for inability to move its back legs and intermittent seizures. It could no longer eat on its own. They were feeding the wrong food, the UV lighting was too far away and their supplements were wrong. This animal was severely hypocalcemic. The owners changed the husbandry and had to hand feed for 3 weeks. It only started eating on its own a week ago.
The real shame was that they had read a husbandry book on bearded dragons, but had interpreted the information in it all wrong.
Now, multiply those potential issues by 10 when dealing with a chameleon. Issues like misting (not as easy as it sounds), insect keeping (you willhave to breed them, because if you don't your pet store provider will leave you in the cold at some point) heating, and the logistic of all of them are quite complex. Why do you see a lot of kids buying chameleons? The pet shops minimize their care. Even though chameleons can live >6 years, most of the ones kept by kids last <1 year.
I'm sure you are going to hear what you want to hear. However, most of what you are hearing on this forum is that chameleons are stressed by handling. Some tolerate it more than others, but very few if any like it. They are display animals that you pamper and then watch from afar. They are not interactive pets. They not only are expensive to establish intitially, they are more expensive to maintain.
If you are really interested in seeing if your children are ready for athis kind of commitment. 1) Have them maintain a cricket, roach and superworm colony (all staples for chameleons) for a couple months. If they are able to do this without issue and are able to create the habitat that allows breeding and propogation of all of the colonies, I would me more convinced that they could handle taking care of a more advanced level of reptile, though I would still start them out with something requiring less humidity, lighting and heat issues. I fear they will they will get bored and not be willing to spend the appropriate to do this necessary chore.
If they are really ready, the worst case scenario would be that you would have a stable supply of food for your new pet.
That's my two cents...
I hope you will reconsider whether you are doing this for the coolness factor, or whether the concern for appropriate care is highest on your children's list.
Matthew Wheelock