If S – T means S is the wife of T, S + T means S is the daughter of T, and S /…

Concept: In coded blood-relation puzzles, each symbol between two people stands for a specific family relation as defined in the question. To decode a chained expression such as M + J / K, resolve each symbol pair using the given code, then combine the individual relations — tracking both the generation gap and the gender — into a single composite relation between the two end people.

Application:

1. The codes given are: '–' = wife of, '+' = daughter of, '/' = son of.

2. Split M + J / K into its two linked codes: M + J and J / K.

3. M + J means M is the daughter of J.

4. J / K means J is the son of K, so K is J's parent.

5. Chaining the two links: K is one generation above J, and J is one generation above M, so K is two generations above M, on the line that runs through a son (J) and ends at a daughter (M).

6. Two generations up through a son, ending at a female descendant, is exactly the grandparent–granddaughter relation, so M is the granddaughter of K.

Cross-check:

• 'K is the father of M' would need only one generation between K and M, but the chain M + J / K spans two generations (through J), so this option is one link short.

• 'J is wife of K' would require the '–' code between J and K, but the expression uses '/' there, which the question defines as 'son of', not 'wife of'.

• 'K and M are Brother' would need M and K to be in the same generation, but M is two generations below K, and M is separately coded as female ('daughter of J'), so a brother relation is impossible either way.

Result: M is the granddaughter of K.