I'm afraid that if you dont know each rabbit's genetic history well enough to know the answer to that question, then they are not suitable to breed from. You need to know the full genetic history a good few generations back, and be aware of the exact breeds and colours that you are breeding, before attempting to breed, you can can end up with horrible consequences - not just deformaties like misaligned jaws, but also general ill health and genetic weakness of the offspring. You also run higher risks of this happening if you crossbreed rabbits, or breed those that are not purebreed, as some sizes and shapes are incompatible with each other and result in health problems either in birthing or the life of the kits, or both.