You have four baby rabbits in a large bird Avery you were told they were all female they are approx now 16 weeks old but two separate breeds it is quite difficult to sex them as they have a lot of fur?

No matter what their sex is you should seperate them into their own individual cages by the time they reach 4 months. They can become agressive to eachother and harm each other so they must be seperated.

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That is not neccessarily true (what was stated above). I have 25 does living together in a large chicken coop, minus the chickens, and they are not agressive towards each other (although some does are). Be sure that they are ALL does though. If they are living together now, they should do fine with age. Learn how to clearly sex them or find a breeder who knows how so there are no unwanted litters.