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The answer should be Sister Because :
Only son of woman’s grandfather – Woman’s father; 
Man’s brother father – Man’s father. 
So, the woman is man’s sister.
Sorry bro,but sister cannot be (man). I think u hadn't read the question carefully.
he asked how i woman related to man 
Lets solve this by mathematical way :
let the man be his
his brother's father would also be his father.
Now,as the woman's grandfather's only son is his's father.
So,the man in the photograph is woman's brother.

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he asked how i woman related to man