Solution

First and foremost, I said, "My friend, 'F', has invited me to his home for a birthday party." So 'F' is definitely a male. Clue number one says he is a journalist.

Let's jump to clue number five, which says that 'B' is the mother of 'E' and 'F'. Thus, 'E' and 'F' are siblings. Clue number one says the doctor is the grandfather of 'F'. So, 'E' is also the doctor's grandchild. It also follows from clues one and five that 'B' is either the daughter or daughter-in-law of the doctor.

Clues six and seven state that there are two married couples, and there are no widows or widowers. This implies that the doctor's wife and B's husband are among those present. The doctor and his wife, 'B' and her husband, 'E' and 'F' make up the six members of the family; there isn't anyone else. The doctor, therefore, has only two grandchildren 'E' and 'F'. Clue number two says, "The doctor had wanted his grand-daughter to be a doctor like him." 'F' is the grandson; so, obviously, 'E' is the grand-daughter.

The doctor is definitely not 'B' or 'E' or 'F' (we have established their relationships). The doctor, therefore, has to be 'A', 'C', or 'D'. But 'C' is an architect (clue four) and 'D' is a classical singer (clue three). Therefore, the doctor is 'A'.

Clue three says 'D' is married to 'A'.

Clue six says there are two married couples in the family. We have already determined one couple 'A' and 'D'. The other couple is from among 'B', 'C', 'E' and 'F'. Clue four says the architect, 'C', is married to the lawyer. 'F' is a journalist; so that rules him out. This implies that 'C' is married either to 'B' or 'E'. So, this obviously means that 'C' is a male because both 'B' and 'E' are females. Now, if 'C' were married to 'E', this would imply that 'B' is a widow because there are no other members in the family. Clue seven says there are no widows; therefore, architect 'C' is married to 'B' who is a lawyer.

In a nutshell, 'A' and 'D' represent the first generation in this family tree. 'A' is a male, and a doctor. 'D' is a female, and a classical singer. 'A' and 'D' are husband and wife.

"C' and 'B' represent the second generation. 'C' is a male and an architect while 'B' is a female and a lawyer. 'C' and 'B' are husband and wife. 'C' is either the son or son-in-law of 'A' and 'D' or, to put it in another way, 'B' is either the daughter-in-law or daughter of 'A' and 'D'. I don't think the clues are adequate to determine this relationship clearly. Am I wrong? Do you think the relationship can be clearly established?

The third generation is represented by 'E' and 'F'. 'F' is the son of 'B' and 'C' and he is a journalist. That leaves only one profession, that of an engineer. So, 'E' is an engineer and she is the daughter of 'B' and 'C'.

Did I do it right?