Color-blindness? Biology help, please!!?

All of them will have normal vision, since the mother's defective x chromosome is masked by the father's good one. However, the daughters will be carriers, as they may give the bad x to a son. This refers to red-green color blindness only; one can also be blue-colorblind, but the gene for blue vision is on an autosome so the probability of coming up with a bad gene from both parents is small so blue-colorblindness is rare.