Bad new neighbors - advice?

I have been placed in a rather awkward position with my new neighbors, who are renting the house to my immediate right.  We live in a five-home cul-de-sac and this is the first home to re-sell in the five years that we have lived here (wow, I just realized that I managed to use three hyphenated phrases in one sentence!).


At any rate, the actual tenant and his family seem nice enough, but they have a set of parents (I think hers) who are older and who actually look homeless.  The homeless grandparents, which is I suppose the easiest shorthand for them, sit outside day and night smoking and drinking, as if they are keeping some sort of vigil.  They look stonefaced, like a homeless version of "American Gothic".  Tonight, my other next door neighbor told me that the old man has a very foul mouth, and that he kicked his fifteen-year old granddaughter in the rear end and told her to "P*** OFF!" loudly while there were kids playing outside.  I have yet to see the four-year old boy wearing anything other than his underwear when he is outside.


The "reason" for sitting outside was explained to one of my other neighbors - they used to have a place with acreage and no air conditioning, so they got used to being outside.  However, it is August in Texas and YOU HAVE A/C NOW!  Additionally, you have a covered patio with a ceiling fan in the back, yet you insist on sitting in the front drinking beer and smoking.  One of my neighbor's kids, who is six, commented that "those people don't have very many teeth."  His 11-year old brother made a comment about "Deliverance" which was actually surprisingly accurate.


My neighbor wants me to contact the owners or the property manager to complain, which I probably will.  I don't think the older couple is on the lease either, yet they always appear to be there.  What would you do?  As a Christian, I am trying very hard not to be overly judgemental, but I also don't want my kids to be unable to play outside without seeing and hearing that stuff.  I would be really interested to hear your comments/suggestions. 


EDIT: After reading the comments thus far, I guess I should add that I was the listing agent when the investor purchased the home, and one of my neighbors (not the same one as above) asked me if we could have said "no investors" when it was in the MLS.  Obviously, this is not possible on a resale home.  I pointed out that the tenants are actually paying more to live here than any of us right now (i.e. their "payment" is higher than mine or my neighbors).  I just hate the perception that it created with my neighbors, even though it was certainly not something I could control.  I have one neighbor who was saying, "Bring us a good buyer!" when the home was on the market, as if I could steer the transaction.  As you all know, the sale occurred because the investor was the first person to bring an acceptable offer.

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