You can say this to your mom and sister:
The rabbit needs daily play time out of the cage (~3 hours a day or so). They are not a display animal. Will you have time for this?
Will you have the time to spend toilet training the rabbit? Will you tolerate potty accidents when the rabbit is out for play time? Who's cleaning the rabbit messes up? Have you bunny proofed your house/room? How will you tolerate chewing and digging? If the rabbit becomes ill, do you have the time and money to take it to a vet?
And regarding snakes and rabbits. I've tried feeding newborn rabbit kits to my big snakes. They didn't know what to do with them. The rabbits were left untouched overnight when these snakes are food pigs. I threw a rat in with the rabbit the next day and the rat was instantly gone. I know all snakes react differently to other animals, but the chances of the rabbit smell bothering your snake probably is very small. Many people do keep their rats and snakes together in the same room after all and haven't seen any ill effect.
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