Reply to comment

Every person carries two genes for eye color. There are three possible combinations. BB, Bb, bb. Each child gets one eye color gene from each of it's parents. The gene for blue eyes is recessive (b), meaning that the gene for brown eyes is dominant (B). You can see that the first of the two combinations (BB, Bb) would result in a brown-eyed child). Two parents with brown eyes can have a blue-eyed child IF they both carry the recessive blue-eyed gene. (Bb + Bb = either BB, Bb or bb)
It's the same with green eyes. Hazel eye color is dominant over blue eyes.

Now if you have TWO parents with recessive genes (bb), meaning each parent has blue eyes, they CANNOT be carrying the gene (B) for brown eyes! Thus, no offspring can have blue eyes! (bb + bb = bb)

Perhaps there is something your mother never knew....