From what I've read on many sites and books:
Males CANNOT be together EVER for they will fight and may seriously harm one another
Females from the same litter who have never been seperated EVER may be able to live together. However, if you paln to breed then the non-pregnant females must be removed for the duration of the pregnancy and they may never meet again for they WILL fight.
I would suggest buying two females from the same litter (They also need very large cages so only two I would recommend) and having an extra cage all set up incase they fight. Remember, they could be fine for a few months but fight for seemingly no reason afterwards.
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