There are no hypoallergenic rabbits (or dogs or cats for that matter). While they can tend to be better for people with allergies, people can still be allergic to them. People do tend to be allergic to bedding (shavings) or hay rather than the actual rabbit.
The people who are interested should come visit the rabbits. If you can,let them meet some adults, preferably ones that are related to the babies. Once the babies are old enough, then they can meet the babies and well and see if there are any issues. You could also offer a trial period for them, a few weeks where the have the rabbit and if it does not work out then they can return the rabbit and get their money back. You could lend a cage if you wanted, but don't need too. It would also be important for them to be around hay as well to see if that is an issue. You can work with bedding and not use some products, but hay is something that is hard to avoid.