I love genetics!

We went to go see the new baby this weekend. He has some blond hair (really, a sunshine brown color). His eyes are still that indeterminate baby color, but I'm hoping he'll have blue eyes. Really, it could happen! I'm pretty sure my grandpa had blue eyes, and if we do our punnet squares, Mina has a 50% chance that she carries the gene... but I think Steve has brown eyes. But does one of his parents have blue eyes? What would be the percentage then? Maybe I don't love genetics.