ANSWER : Niece

Explanation : . As given information in the question, His mother's only daughter (His sister) is my mother. Therefore, the man in the photograph is the brother of Reena's mother, as a result Reena is related as niece to that man.

ANSWER : Cousin

Explanation : . Brother of woman's mother is the maternal uncle of the woman and the son of maternal uncle is related as cousin to the woman.

ANSWER : Uncle

Explanation : . As the given information in the question, B's mother is the only daughter of A's mother. In other words, B is the grandson of A's mother. Hence, A is the uncle of B (Assuming A being male).

ANSWER : Uncle

Explanation : . Father of Deepak's daughter is Deepak himself and brother of gentleman is father of Deepak. Hence, that gentleman is related as Uncle to Deepak.

ANSWER : Father-in-law

Explanation : . The only daughter of Neeraj's wife is the daughter of Neeraj and her husband is the son-in-law of Neeraj.