Can you keep a mother and a daughter rabbit together forever?

It depends

If you have 1 rabbit and then later get another, they rabbits (if they don't know each other ) are likely to attack each other because the first rabbit would probably be Territorial .

Thankfully they have places (i think pets at home does it) were they let the rabbits met and get used to each other, then make sure that they are safe before giving you the rabbit , if you do that I'm sure u can have 3 ...

But if u get 3 rabbits at the same time at the same place, I'm sure (if they say so) you'll be fine.

Also make sure all your rabbits are spade !

You can not put three rabbits together even if they are spayed/neutered!! Rabbits are territorial and will fight if they feel they do not have enough space. Also if you try it you will probably find your 'sweet, cuddly' bunnies with slit ears, chunks of fur missing and their bellies layed open. It is not a pretty sight, please get your pets their own cages, don't risk your sweet pets.