Explanation:

- W is travelling with his daughters, D and P.

- This means W is the father, and D and P are his daughters.

- M is travelling with his maternal grandmother, Y.

- So Y is M’s maternal grandmother (mother’s mother).

- D is the mother of M.

- Therefore, D is the daughter of W and the mother of M.

- Since Y is the mother of D (as D is M's mother and Y is M's maternal grandmother),

- it means Y is also the mother of P (since D and P are siblings and both daughters of Y).

So, Y is the mother of P.

Option:1 - Daughter

Option:2 - Mother

Option:3 - Grandmother

Option:4 - Sister

Option:2 - Mother is the correct answer.