In a certain code language,
* $A+B$ means ‘A is the mother of B’
* $A-B$ means ‘A is the brother of B’
* $A\times B$ means ‘A is the wife of B’
* $A÷B$ means ‘A is the father of B’

Based on the above, how is A related to E if $A÷B-C+D-E\times F$?

Let's decode the expression $A÷B-C+D-E\times F$ step by step from left to right to build a family tree:
1. $A÷B\to$ A is the father of B. ($A$ is Male $[+]$)
2. $B-C\to$ B is the brother of C. ($B$ is Male $[+]$; B and C are siblings)
3. $C+D\to$ C is the mother of D. ($C$ is Female $[-]$)
4. $D-E\to$ D is the brother of E. ($D$ is Male $[+]$; D and E are siblings)
5. $E\times F\to$ E is the wife of F. ($E$ is Female $[-]$; $F$ is Male $[+]$)

From the above breakdown:

* D and E are siblings, and C is their mother.
* B and C are siblings, and A is their father.

Since C is the mother of E, and A is the father of C, A is the mother's father (maternal grandfather) of E.