Question 1
If:
A = brother of, B = sister of, C = father of, D = mother of, E = son of, F = daughter of, G = husband of, H = wife of
Then what does 'Nancy D Sita and Sita F Claire' mean in terms of Nancy's relation to Claire?
D = 'mother of', F = 'daughter of'. Combining: Nancy is mother of Sita, and Sita is daughter of Claire. Therefore, Nancy is grandmother of Claire.