Let us first decode the given symbols and then draw a family tree.
J is
Symbol
%
+
?
Meaning
Father
Sister
Daughter
Of H
Now draw a family tree using the following notations:
K is the grandfather of L can be represented as K % M % L. K % M means K is the father of M M % L means M is the father of L Therefore, we can derive that K is the grandfather of L. Hence, K % M % L is the correct answer.