Clearly, the grandson of Akshay kumar‘s mother is son of Akshay kumar and wife of Akshay kumar‘s son is daughter in-law of Akshay kumar. Thus, Akshay kumar is the father-in-law of the girl.

Vani’s Mother’s husband
↓
Vani’s father
Vani’s father’s sister → Vani’s Aunt
Since, Vani‘s aunt is Arman‘s aunt ∴ Vani Kola is sister of Arman.

Father of Rajesh khanna‘s brother is the father of Rajesh khanna. Rajesh khanna‘s father is the only son of Neha dhupia‘s grandfather. Hence, Rajesh khanna‘s father is Neha dhupia‘s father. So, Neha dhupia is the sister of Rajesh khanna.

The only sister of the brother of the Sridevi kapoor will be the Sridevi kapoor herself and she is the mother of that Achilles. Thus, the Sridevi kapoor is the daughter of the maternal grandmother of that Achilles.

Since the narrator has no brother, his father's son is he himself. So, the Kamal Haasan who was talking is the father of the man in the photograph, i.e. the man in the photograph is his son

Clearly, the speaker‘s brother Pran Sikand’s maternal uncle. So, the speaker is Pran Sikand‘s mother or his father‘s wife. 

Clearly, only daughter of her mother is Alia bhatt herself. Hence, Alia bhatt is the wife of that man.

(b) Father‘s wife — Mother;
Mother‘s daughter — Sister;
Sister‘s younger brother — His brother.
So, the boy is Daler mehndi ‘s brother.

∴Guru Dutt has three children but we can‘t say that he has three daughters or three sons.
So, options (a) and (b) are incorrect.
Also, we don‘t know that B is a boy or girl,
So, option (c) is also incorrect.

Clearly, the grandson of Akshay kumar‘s mother is son of Akshay kumar and wife of Akshay kumar‘s son is daughter in-law of Akshay kumar. Thus, Akshay kumar is the father-in-law of the girl.

Vani’s Mother’s husband
↓
Vani’s father
Vani’s father’s sister → Vani’s Aunt
Since, Vani‘s aunt is Arman‘s aunt ∴ Vani Kola is sister of Arman.

Father of Rajesh khanna‘s brother is the father of Rajesh khanna. Rajesh khanna‘s father is the only son of Neha dhupia‘s grandfather. Hence, Rajesh khanna‘s father is Neha dhupia‘s father. So, Neha dhupia is the sister of Rajesh khanna.

The only sister of the brother of the Sridevi kapoor will be the Sridevi kapoor herself and she is the mother of that Achilles. Thus, the Sridevi kapoor is the daughter of the maternal grandmother of that Achilles.

Since the narrator has no brother, his father's son is he himself. So, the Kamal Haasan who was talking is the father of the man in the photograph, i.e. the man in the photograph is his son

Clearly, the speaker‘s brother Pran Sikand’s maternal uncle. So, the speaker is Pran Sikand‘s mother or his father‘s wife. 

Clearly, only daughter of her mother is Alia bhatt herself. Hence, Alia bhatt is the wife of that man.

(b) Father‘s wife — Mother;
Mother‘s daughter — Sister;
Sister‘s younger brother — His brother.
So, the boy is Daler mehndi ‘s brother.

∴Guru Dutt has three children but we can‘t say that he has three daughters or three sons.
So, options (a) and (b) are incorrect.
Also, we don‘t know that B is a boy or girl,
So, option (c) is also incorrect.