Help about Binary Tree

I am struggling in writing a method to return the parent node of a given Tree node. The class of the Tree is following:

class BinaryTree {
int data;
BinaryTree *left;
BinaryTree *right;
BinaryTree(int i, BinaryTree *L, BinaryTree *R) {
data=i; left=L; right=R;
~BinaryTree() {}
int RootData() { return data; }
BinaryTree* Left() { return left; }
BinaryTree* Right() { return right;}

The problem is that I need to write a member function which takes a Tree Node argument and returns the parent node of that node.

Thanks very much!
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