A is B's sister C is B's mom D is C's dad E is D's mom F is C's husband G is F's dad now tell what A is related to F?

Answer 1

Here's a tree:

E---(?)

|

(?)---G D---(?)

| |

F------C

| |

A B

As you can see, A is F's daughter -- or F is A's father.

If you were to get picky, however, you could say that C and A's father could have divorced; in the real world, a man married to your mom is not necessarily your father. In that case, there is uncertainty: he could either be A's father, or step-father.