In a family of six person A, B, C, D, E and F there are two married couples. <br /> D is grandmother of A and mother of B.<br /> C is wife of B and mother of F<br /> F is the grand daughter of E <br /> Which among following is couple?
$$ \begin{array}{c} \text{E (Grandfather)} \iff \text{D (Grandmother)} \\ \downarrow \\ \text{B (Father)} \iff \text{C (Mother)} \\ \downarrow \\ \text{A} \quad \text{and} \quad \text{F} \end{array} $$
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