Explanation:

- A is an engineer and married to the stenographer.

- The judge is married to the lawyer.

- F, the draughtsman, is the son of B and brother of E.

- C, the lawyer, is the daughter-in-law of D.

- E is an unmarried doctor.

- D is the grandmother of F.

- There are two married couples in the family.

From above:

- A (engineer) is married to the stenographer.

- Judge is not married to B; hence B is not the judge.

- F is the son of B, and since D is the grandmother, B is the daughter of D, leaving C as the daughter-in-law and lawyer.

- B must be the judge because that fits with the remaining pairing and descriptions.

Thus, the profession of B is: Option 1: Judge