Directions : Study the following information carefully and answer the given…

Concept

In coded blood-relation puzzles, first decode every symbol into a directed relationship that fixes each person's gender and generation, then chain the relations to place everyone in one family tree. The marriage, parent and sibling/in-law codes together fix which generation a person sits in. 'Sister-in-law' specifically means a brother's wife or a spouse's sister, never a person's own blood sister.

Decoding the relations

1. Y*L: Y is the wife of L, and Y#W: Y is the mother of W. So Y (female) and L (male) are a married couple, and W is their child, one generation below Y.

2. W*Z: W is the wife of Z; T@Z: T is the brother of Z; R*T: R is the wife of T. So Z and T are brothers, W married Z, and R married T.

3. U&Z: U is the sister-in-law of Z. R (brother T's wife) already fills the brother's-wife role, so U takes the other form: U is the sister of Z's wife W. Hence U is another child of Y and L, i.e. Y's daughter.

4. U#K: U is the mother of K; J*K: J is the wife of K (so K is male); O%J: O is the father-in-law of J, i.e. O is K's father. So U and O are the parents of K, and K is Y's grandchild.

5. I&J: I is the sister-in-law of J. J's husband is K, so I is the sister of K, another child of U and O.

Tracing I to Y

Y is the mother of U (U being W's sister and so Y's daughter). U is the mother of I. Therefore I is the daughter of Y's daughter, which makes I the grand daughter of Y. The sister-in-law code (&) that introduces I marks her as female, confirming 'grand daughter' rather than 'grandson'.

Cross-check

Reading the chain bottom-up: I to U (mother) to Y (mother) is a two-step descent of two generations along the female line, so I sits two generations below Y as a female. That is exactly a grand daughter, and it rules out 'Daughter' (only one generation) and 'Son/Grandson' (male).