Believe me, he would know.
Your nephew is spot on and I can vouch for what he says.
The mexican blood American that has worked all his/her life in southern Texas hates the wetbacks coming across the borders and calls them such or calls them mujeros(moo HAIR os).
These people see the drug/smuggling traffic ruining the younger generation. The younger generation start by placing water/food at drop off points for the illegals or drug smugglers. Then the young ones progress to humpers for the guides/smugglers of the illegals to learn the trails. Then they become the smugglers or drivers of the cars at the pickup points.
Ruining the next and future generations.
Big money