What are the genotypes of the grandparents?

To determine the genotypes of the grandparents, we would need specific information about their traits, such as whether they exhibit dominant or recessive characteristics. Each grandparent could have various combinations of alleles, such as homozygous dominant (AA), heterozygous (Aa), or homozygous recessive (aa). If the traits in question are inherited in a Mendelian manner, analyzing the genotypes of the parents and their phenotypes can help infer the possible genotypes of the grandparents. Without specific details, it's impossible to provide a definitive answer.