Read the following passage and solve the questions based on it.
In the famous movie—Hum Saat Aath Hain there were six persons A, B, C, D, E and F in the family. C is the sister of F. B is the brother of E’s husband. D is the father of A and grandfather of F. There are 2 fathers, 3 brothers and a mother in the family and only these six people were the members of the family.
Who is the mother?