#include <iostream>
#include <string.h>
#include <stdio.h>
#include <spawn.h>
#include <unistd.h>
#include <sys/wait.h>

using namespace std;

int main()
{

cout<<"Begning of the program"<<endl;
int counter=0;
pid_t child1=fork();



if(child1==0)
{

    cout<<"Child1 Process"<<endl;
    cout<<"Process ID: "<<getpid()<<endl;
    cout<<"Parrent ID: "<<getppid()<<endl;


}
else if(child1>0)
{
    pid_t child2=fork();
     if(child2>0)
     {
        cout<<"Parrent of Child1 and Child2"<<endl;
        cout<<"Process ID: "<<getpid()<<endl;
        cout<<"Parrent ID: "<<getppid()<<endl;

     }
    else if(child2==0)
     {
        cout<<"Child2 Creadted"<<endl;
        cout<<"Process ID: "<<getpid()<<endl;
        cout<<"Parrent ID: "<<getppid()<<endl;

     }

    else
    {
        cout<<"Process Failed"<<endl;
    }

}
else
{
        cout<<"Process fail"<<endl;

}

cout<<"End "<<endl;

return 0;

}

Begning of the program
Parrent Process
Process ID: 23539
Parrent ID: 23296
End
Child1 Process
Process ID: 23540
Parrent ID: 1303
End
Child2 Process
Process ID: 23541
Parrent ID: 1303
End
Child1 Process
Process ID: 23542
Parrent ID: 1303
End