Pointing to a lady, Rashmi said - "My father's daughter is the sister of this lady's daughter." How is that lady related to Rashmi?

Mother

ATQ,

*********************************************************

Please note:

  l   ⇒ Vertical line shown "generation gap".

 =  ⇒ Double lines shown "relation of spouse" 

—  ⇒ Horizontal line shown "relation in same generation other than spouse".

     ⇒ Rectangular box shown " Male".

     ⇒ Circular box shown " Female".

*********************************************************