If the brothers or friend had a phone, I'd probably text them before I even got there. To get the wrong address, he obviously wasn't eyeballing it and hadn't been there before, so he did have a phone and actually entered the wrong address, so doesn't seem the brothers did have phones. If there's nobody to call or text, yeah, I'd probably look around the house.
It probably goes text them before getting there, wonder why the hell the lights are off and checks gps to nake sure I'm at the right place, then open the storm door to knock on the main door in case the doorbell isn't working. Just stand there and stare blankly at a door nobody's answering doesn't really make the checklist. None of those things are the wrong thing for the guy to do btw, but he's not the one being charged, so it's just a matter of whether the old guy reasonably thought it was an attempted robbery.
The "he was a racist just looking for a black kid to shoot" doesn't hold any water, because a guy going 84 years with an unbelievable urge to shoot a random black guy, and he just happened to have one at his front door at 10pm is a
Like I've asked several posters with no response, if it was your wife home alone and she called you at 10pm and said there was a strange guy on the porch in a high crime city, would you tell her "just answer the door, you bigot, he probably typed the wrong address into gps"?