Each of their sons has around a 0% chance for being color blind.
they will have normal girls but they will be carriers
Explanation:
Since the man is colour blind and he donates the X- Chromosome that is the carrier to the woman, they will give birth to a daughter who is a carrier but not color blind. If the man donates the Y chromosome, then they will give birth to a normal male child who is not color blind neither is he a carrier
