APPSC Group-I Preliminary Exam 2008 Solved Paper

In a family, there are six members, A, B, C, D, $\mathrm{mathbf}\mathit{E}$ and $\mathit{F}$. $\mathit{A}$ and $\mathit{B}$ are a married couple, $\mathit{A}$ being the female member. $\mathit{D}$ is the only daughter of $\mathit{C}$, who is the sister of $\mathit{A}.\mathit{E}$ is the brother of $\mathit{D}.\mathit{B}$ is the son-In-law of $\mathit{F}$, whose wife has already expired. How is E related to $\mathit{F}$ ?