evil_child() kills all parents and siblings, leaving only itself alive to do what it pleases (like cleaning things up)

evil_child.py

import os
import signal
import time
from multiprocessing import Process

def kill_all(parent_pid):
    os.killpg(os.getpgid(parent_pid), signal.SIGKILL)

def evil_child(parent_pid):
    print("Killing my parents and siblings...")
    os.setpgrp()
    kill_all(parent_pid)
    print("Done killing everyone, but I'm still alive! HaHaHa!!!")

def child(name):
    for i in range(10):
        print("{} - {}".format(name, i))
        time.sleep(1)

def start_children():
    for i in ['a','b','c']:
        p = Process(target=child, args=(i,))
        p.start()

start_children()
time.sleep(1)
p = Process(target=evil_child, args=(os.getpid(),))
p.start()