The person standing to the left-hand corner of the photographer is the sister-in-law of G, who is the female member of the family.
4 persons are standing to the left of photographer and rest are standing to the right of photographer.
The person standing at the right end of the row is unmarried.
So, we get: -

And,

D is the father-in-law of B, who is the brother-in-law of the person standing at the right end of the row.
Now, the sister-in-law of G is standing at the right end of the row.
So, wife of B is the sister of the person standing at the right end of the row and D is the father of 3 children as shown below.

No sibling in the family is standing beside each other.
D is standing to the immediate left of his wife and to the immediate right of his granddaughter.
The person standing at the right-hand corner of the photographer is male.
B is standing to the immediate right of his mother-in-law and to the immediate left of his unmarried sister-in-law.
So, we get: -

And,

C is neither standing at the end of the row nor is married.
So, C must be the daughter of B (i.e. granddaughter of D).
A is not the married female person in the family.
So, A is either unmarried female person or is the male person of the family.
Case 1: -
Let, A is unmarried female person of the family.

And,

Case 2: -
Let, A is the male person of the family.
So, A must be married to G.

And,

Only 1 person is standing between A and E.
F is standing at the end of the row.
Case 1: -

And,

Case 2: -

And,

Any daughter-in-law of in the family is not standing adjacent to her mother-in-law.
So, case 1 is invalid.
Final Solution:

And,

C is standing 4th from the left end of the row.