Rabbits As Childrens Pets
Rabbits are not children's pets. No child should be given the responsability for the care of an animal. The responsability lies with the adult. If you are not willing to assume full responsability for all the work and care involved then don't get the rabbit. By all means a child can help feed the rabbit, clean it and play with it but all these should be undertaken superived. You can also not rely on a child to notice when a rabbit is ill.
Older children may lose interest in rabbits as they grow into teenagers, going off to college or university is a common time for rabbits to be given up to sanctuaries. Remember you need to consider the rabbits full lifespan not just the next few months.
If you are unsure you can care for a rabbit that length of time, consider adopting an older rabbit or fostering instead.