A woman with achondroplasia (a dominant form of dwarfism) and a phenotypically unaffected man have seven children,

Question:

A woman with achondroplasia (a dominant form of dwarfism) and a phenotypically unaffected man have seven children, all of whom have achondroplasia. What is the probability of producing such a family if this woman is a heterozygote? What is the probability that the woman is a heterozygote if her eighth child does not have this disorder?