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 'Jessica D Juan and Juan D Nisha' mean in terms of Jessica's relation to Nisha?
D = 'mother of', D = 'mother of'. Combining: Jessica is mother of Juan, and Juan is mother of Nisha. Therefore, Jessica is great-grandmother of Nisha.