@Ross Ellington You could consider volunteering for Habitat for Humanity, it's a quick way to ask questions and learn how to build a house.

Do I call the employer and ask for the human resources department?

From the what I can gather, the owner doesn't have a strong enough relationship with his sister (front house tenant) to play the "family card" or appeal to the humanity in her. 

A Humane Economy by Wilhelm RopkeDon't be part of the problem.

@Phillip Collie - No, it is not too hard to get a mobile home dealer license. 

I have flipped a ton of them(land/home) and am a dealer here in NC.

And they do not see or realize it because they friggin REFUSE to use logic, intelligence and common sense.When people see some stranger calling them out and telling them "you are doing it wrong" they go on the defensive, get insulted and retaliate instead of shutting the hell up, step back see the logic in the writings and admit.. wait a sec.. this monkey is annoying BUT he has a point, and LEARN change adapt.I would have happily entertained your reservations and concerns, but I suggest learn how to approach and express politely with respect like a human being and don't get your panties all twisted up when your unwarrented snarky responses get you a fiery answer back!

I'll also treat people as humans. 

off the top of my head I've seen latelyArcher (for the crass only)Californication (ahem, also for the crass)The 13th (a film, I happen to think every human on the planet ought to watch it, documents the Black American Experience)Requiem For The American Dream (commentary on American political power by Noam Chomski.

It would be the human thing to do to find common ground.