Depends on the furry family. With dogs, you'll have to be very careful and always be sure the bunny is secured, either in your hands or in a cage/carrier when the dog is around. Especially if the dog is bred from hunting/sporting lines. Most dogs like chasing and attacking rabbits - they can't help it, it's in their nature. Many a beloved pet rabbit has been lost to a pet dog.
Cats tend to be safer, but you still have to be cautious. Chances are, your bun will regard a cat as just another piece of furniture, but the cat will be curious about this strange little fuzzball and follow it around. It might even try swatting at the bun, which can be very dangerous as cat claws are sharp. Cats play rough and bunnies are delicate, so if your cat starts trying to initiate play with your bunny, you need to shut that down right away. Even if the cat doesn't hurt it, bunnies can and will kick out and bite if they're being annoyed. So either way, someone will get hurt.
I've heard of cats and rabbits co-existing eventually though, so if you've got a good handle on your pets' personalities and think they're unlikely to bother each other, go ahead and make introductions! I still wouldn't leave them alone unsupervised, but they'd probably be fine hanging out together every now and then if a human's around to make sure things don't get too rough.