The degree of earlobe attachment in humans is inherited as a…

The degree of earlobe attachment in humans is inherited as a simple dominant allele for free earlobes (F), or as a recessive allele of attached earlobes (f). What is the probability that a woman with attached earlobes will have children with attached earlobes if her husband has free earlobes, but the grandfather (husbands father) had attached earlobes.