I find it extremely aggravating when my stepmom and my sister allow her kids to come upstairs to…

I find it extremely aggravating when my stepmom and my sister allow her kids to come upstairs to play knowing that my son is asleep. He wakes up within 5 seconds of them walking up the stairs. This is attempt 3 of trying to put him back to sleep because he is so grouchy when he doesn't get a full nap out and it was ruined yet again because they are sitting by right outside my door banging on shit and yelling. Seriously what kind of hell am I living in?! I'm trying to get school shit done too and it's impossible.