It's possible they tried to help him escape the area,but they were also present in the trailer while he was raping the girl.It's highly probable that they were aware that Couey had the girl.Accesories before and after.Sleazeballs.
And how could they be unaware that he was digging a huge hole in the yard? And did that puny little piece of garbage dig that hole all by himself?
I suspicion NOT