Another amateur move! Turn the lights off when you have the blinds down, otherwise people can easily spot you. This guy is not being super impressive so far (at least he is actually downing zombies and not getting hit).
Faaaak, this is going poorly. He let them see his sister and even reveal that they have food. Jesus christ, just kill them already. They're throwing up red flags anyway (WE DEMAND ENTRY, YOUR SISTER IS HOT, LET US IN), you seriously ought to just murder them on the spot.
The number of errors he's made despite having tons of experience and forewarning is not a good sign. If he doesn't start wising up, I can see myself dropping this pretty quick. (I don't like seeing constant fuckups even for those who don't have tons of experience and forewarning, so it hurts even more like this)