Please help me with this simple program.

[brave heart]

#include <iostream>

using namespace std;

class CFather{
public:
CFather() { InitInstance(); }
virtual void InitInstance(){
cout << "I am the father." << endl;
}
};

class CSon : public CFather{
public:
void InitInstance(){
cout << "I am the son." << endl;
}
};

int main()
{
CSon son;
return 0;
}



The program's output is:
I am the father.

How can I make the CFather's constructor invoke the InitInstance function defined in the CSon?
Thanks a lot!