Biology cl need help?

bb for the father, Bb for the mother...and if you stick it on a punnett square, I'm not even sure that they can have a probability of having 3 children all with blue eyes. Blue eyes are a zygous recessive trait, and the mother has to have only one big "B" in her genotype to have brown eyes and a son with blue eyes. Then again, this is just a prediction, so there would be a 50% chance they would have their next child with blue eyes.