There is no way you can call the superclass's superclass. Actually if you have
public class C extends B . . .
public class B extends A . . .
that implies that a "C" IS-A "B"; if you try to call the method from "A" then your "C" object NO-LONGER-IS-An "A". So you are breaching the conventions of inheritance. If you search, you will find old threads about the same topic; similar questions come up about every two months.
And welcome to JavaRanch
And I won't tell you how you can cheat with a classcast.