Don't a chase a rabbit. Being prey animals, they think that if you chase them you are trying to hurt them.
Don't pull your rabbit by the ears. That can hurt them REALLY bad!
Don't sneak up on your rabbit, that's what animals do that want to eat them!
Don't squeeze your rabbit and encourage children to only hold the rabbit with adult supervision and while they are sitting on the ground. If a rabbit is dropped, they could break every bone in their tiny body!
These are just some simple things to talk to your children about before bringing your rabbit home. Prepare them!