MY MOTHER AT SIXTY-SIX

The painting 'My Mother' was made by :

Pointing towards A, B said "your mother is the younger sister of my mother". How is A related to B ?

Pointing to the photograph of a lady. A man said,''She is my son's mother's husband's mother. '' How is the man related to the lady in the photograph ?

Ramu's mother said to Ramu, "My mother has a son whose son is Achyut". How is Achyut related to Ramu?