Concept:Tracing blood relations through parents and siblings can determine the relationship between two people.
Explanation:Q’s mother is the sister of P.
This means Q’s mother and P are siblings.
Both are children of M, so M is the parent of P.
S is the daughter of P and the sister of T.
Since S and T are siblings, T is also a child of P.
Therefore, P is the parent of T, and M is the parent of P.
So, M is the grandparent of T.
The gender of M is not mentioned in the question.
Hence, M can either be the grandfather or the grandmother of T.
Answer:Option D — Grandfather or Grandmother.
