A + B means ‘A is the wife of B’, A – B means ‘A is the mother of B’, A × B…

Step-by-step reasoning:

1. M × T means M is the son of T (T is a parent of M).

2. T – G means T is the mother of G (so T is female and a parent of G).

3. G ÷ H means G is the daughter of H, so H is the father of G.

4. Since T is the mother of G and H is the father of G, T and H are the parents of G and therefore a married couple. Because T is also the parent of M, H is the other parent of M (father of M).

5. H × S means H is the son of S (S is a parent of H).

6. S + P means S is the wife of P, so P is the husband of S and thus the father of H.

Conclusion: P is the father of H, and H is the father of M; therefore P is the father's father of M (paternal grandfather).