Woman's genotype: ii Husband's genotype: I^A i -> possible husband's father genotypes are two I^B and I^B i -> if husband's father has two I^B alleles, the husband will have one I^B allele present, which is not the case. So, there is i allele present. (can also infer that I^A comes from husband's mother)
Child's possible genotypes: ii, ii, I^A i, I^A i probability is 1/2
