This will find the PPID - Parent Process ID of the give PID

ppid.c

#include <windows.h>
#include <stdio.h>
#include "tlhelp32.h"
/* Title: This will find the PPID - Parent Process ID of the give PID
 * Author: Osanda Malith Jayathissa (@OsandaMalith)
 * Example: ppid.exe 1620
 * PID: 1620 | PPID: 776 | Name: calc.exe 
 */
int main(int argc, char *argv[]) {
    int pid = 0;
    HANDLE h = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    PROCESSENTRY32 pe;
    pe.dwSize = sizeof(PROCESSENTRY32);

    pid = (argc > 1) ?  atoi(argv[1]) : GetCurrentProcessId();

    if(Process32First(h, &pe)) {
    	do 
                if (pe.th32ProcessID == pid) 
    			printf("PID: %i | PPID: %i | Name: %s\n", pid, pe.th32ParentProcessID, pe.szExeFile);
    	while(Process32Next(h, &pe));
    }
    CloseHandle(h);
}
//EOF